1.
Album
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Album, is a collection of audio recordings issued as a single item on CD, record, audio tape, or another medium. Albums of recorded music were developed in the early 20th century, first as books of individual 78rpm records, vinyl LPs are still issued, though in the 21st century album sales have mostly focused on compact disc and MP3 formats. The audio cassette was a format used from the late 1970s through to the 1990s alongside vinyl, an album may be recorded in a recording studio, in a concert venue, at home, in the field, or a mix of places. Recording may take a few hours to years to complete, usually in several takes with different parts recorded separately. Recordings that are done in one take without overdubbing are termed live, the majority of studio recordings contain an abundance of editing, sound effects, voice adjustments, etc. With modern recording technology, musicians can be recorded in separate rooms or at times while listening to the other parts using headphones. Album covers and liner notes are used, and sometimes additional information is provided, such as analysis of the recording, historically, the term album was applied to a collection of various items housed in a book format. In musical usage the word was used for collections of pieces of printed music from the early nineteenth century. Later, collections of related 78rpm records were bundled in book-like albums, the LP record, or 33 1⁄3 rpm microgroove vinyl record, is a gramophone record format introduced by Columbia Records in 1948. It was adopted by the industry as a standard format for the album. Apart from relatively minor refinements and the important later addition of stereophonic sound capability, the term album had been carried forward from the early nineteenth century when it had been used for collections of short pieces of music. Later, collections of related 78rpm records were bundled in book-like albums, as part of a trend of shifting sales in the music industry, some commenters have declared that the early 21st century experienced the death of the album. Sometimes shorter albums are referred to as mini-albums or EPs, Albums such as Tubular Bells, Amarok, Hergest Ridge by Mike Oldfield, and Yess Close to the Edge, include fewer than four tracks. There are no rules against artists such as Pinhead Gunpowder referring to their own releases under thirty minutes as albums. These are known as box sets, material is stored on an album in sections termed tracks, normally 11 or 12 tracks. A music track is a song or instrumental recording. The term is associated with popular music where separate tracks are known as album tracks. When vinyl records were the medium for audio recordings a track could be identified visually from the grooves
2.
Alternative rock
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Alternative rock is a genre of rock music that emerged from the independent music underground of the 1980s and became widely popular in the 1990s and 2000s. In this instance, the word refers to the genres distinction from mainstream rock music. The terms original meaning was broader, referring to a generation of musicians unified by their debt to either the musical style or simply the independent. Ethos of punk rock, which in the late 1970s laid the groundwork for alternative music, Alternative rock is a broad umbrella term consisting of music that differs greatly in terms of its sound, its social context, and its regional roots. Most of these subgenres had achieved minor mainstream notice and a few bands representing them, such as Hüsker Dü, with the breakthrough of Nirvana and the popularity of the grunge and Britpop movements in the 1990s, alternative rock entered the musical mainstream and many alternative bands became successful. By the end of the decade, alternative rocks mainstream prominence declined due to a number of events that caused grunge and Britpop to fade, emo attracted attention in the larger alternative rock world, and the term was applied to a variety of artists, including multi-platinum acts. Post-punk revival artists such as Modest Mouse and The Killers had commercial success in the early, before the term alternative rock came into common usage around 1990, the sort of music to which it refers was known by a variety of terms. In 1979, Terry Tolkin used the term Alternative Music to describe the groups he was writing about, in 1979 Dallas radio station KZEW had a late night new wave show entitled Rock and Roll Alternative. College rock was used in the United States to describe the music during the 1980s due to its links to the radio circuit. In the United Kingdom, dozens of small do it yourself record labels emerged as a result of the punk subculture, according to the founder of one of these labels, Cherry Red, NME and Sounds magazines published charts based on small record stores called Alternative Charts. The first national chart based on distribution called the Indie Chart was published in January 1980, at the time, the term indie was used literally to describe independently distributed records. By 1985, indie had come to mean a particular genre, or group of subgenres, at first the term referred to intentionally non–mainstream rock acts that were not influenced by heavy metal ballads, rarefied new wave and high-energy dance anthems. The use of alternative gained further exposure due to the success of Lollapalooza, for which festival founder, in the late 1990s, the definition again became more specific. Defining music as alternative is often difficult because of two conflicting applications of the word, the name alternative rock essentially serves as an umbrella term for underground music that has emerged in the wake of punk rock since the mid-1980s. Alternative bands during the 1980s generally played in clubs, recorded for indie labels. Sounds range from the gloomy soundscapes of gothic rock to the guitars of indie pop to the dirty guitars of grunge to the 1960s/1970s revivalism of Britpop. This approach to lyrics developed as a reflection of the social and economic strains in the United States and United Kingdom of the 1980s, by 1984, a majority of groups signed to independent record labels mined from a variety of rock and particularly 1960s rock influences. This represented a break from the futuristic, hyper-rational post-punk years
3.
Progressive rock
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Progressive rock is a broad subgenre of rock music that developed in the United Kingdom and United States throughout the mid to late 1960s. Prog is based on fusions of styles, approaches and genres, Prog saw a high level of popularity in the early-to-mid 1970s, but faded soon after. Conventional wisdom holds that the rise of rock caused this. Music critics, who labelled the concepts as pretentious and the sounds as pompous and overblown. Early groups who exhibited progressive features are described as proto-prog. In 1967, progressive rock constituted a diversity of loosely associated style codes, the Canterbury scene, originating in the late 1960s, denoted a subset of prog bands who emphasised the use of wind instruments, complex chord changes and long improvisations. Rock in Opposition, from the late 1970s, was more avant-garde, in the 1980s, a new subgenre, neo-progressive rock, enjoyed some commercial success, although it was also accused of being derivative and lacking in innovation. Post-progressive draws upon newer developments in music and the avant-garde since the mid 1970s. The term progressive rock is synonymous with art rock, classical rock, historically, art rock has been used to describe at least two related, but distinct, types of rock music. Similarities between the two terms are that they describe a mostly British attempt to elevate rock music to new levels of artistic credibility. However, art rock is likely to have experimental or avant-garde influences. Prog was devised in the 1990s as a term, but later became a transferable adjective. Although a unidirectional English progressive style emerged in the late 1960s, by 1967, critics of the genre often limit its scope to a stereotype of long solos, overlong albums, fantasy lyrics, grandiose stage sets and costumes, and an obsessive dedication to technical skill. Author Kevin Holm-Hudson believes that rock is a style far more diverse than what is heard from its mainstream groups. They each do so largely unconsciously, academic John S. Cotner contests Macans view that progressive rock cannot exist without the continuous and overt assimilation of classical music into rock. Debate about the criteria and scope of the genre continues in the 2010s. In early references to the music, progressive was partly related to progressive politics, Cotner also says that progressive rock incorporates both formal and eclectic elements, It consists of a combination of factors – some of them intramusical, others extramusical or social. One way of conceptualising rock and roll in relation to music is that progressive music pushed the genre into greater complexity while retracing the roots of romantic
4.
Guitar
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The guitar is a musical instrument classified as a fretted string instrument with anywhere from four to 18 strings, usually having six. The sound is projected either acoustically, using a wooden or plastic and wood box, or through electrical amplifier. It is typically played by strumming or plucking the strings with the fingers, the guitar is a type of chordophone, traditionally constructed from wood and strung with either gut, nylon or steel strings and distinguished from other chordophones by its construction and tuning. There are three types of modern acoustic guitar, the classical guitar, the steel-string acoustic guitar, and the archtop guitar. The tone of a guitar is produced by the strings vibration, amplified by the hollow body of the guitar. The term finger-picking can also refer to a tradition of folk, blues, bluegrass. The acoustic bass guitar is an instrument that is one octave below a regular guitar. Early amplified guitars employed a body, but a solid wood body was eventually found more suitable during the 1960s and 1970s. As with acoustic guitars, there are a number of types of guitars, including hollowbody guitars, archtop guitars and solid-body guitars. The electric guitar has had a influence on popular culture. The guitar is used in a variety of musical genres worldwide. It is recognized as an instrument in genres such as blues, bluegrass, country, flamenco, folk, jazz, jota, mariachi, metal, punk, reggae, rock, soul. The term is used to refer to a number of chordophones that were developed and used across Europe, beginning in the 12th century and, later, in the Americas. The modern word guitar, and its antecedents, has applied to a wide variety of chordophones since classical times. Many influences are cited as antecedents to the modern guitar, at least two instruments called guitars were in use in Spain by 1200, the guitarra latina and the so-called guitarra morisca. The guitarra morisca had a back, wide fingerboard. The guitarra Latina had a sound hole and a narrower neck. By the 14th century the qualifiers moresca or morisca and latina had been dropped, and it had six courses, lute-like tuning in fourths and a guitar-like body, although early representations reveal an instrument with a sharply cut waist
5.
Synthesizer
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A synthesizer is an electronic musical instrument that generates electric signals that are converted to sound through instrument amplifiers and loudspeakers or headphones. Synthesizers may either imitate instruments like piano, Hammond organ, flute, vocals, natural sounds like ocean waves, etc. or generate new electronic timbres. Synthesizers without built-in controllers are called sound modules, and are controlled via USB, MIDI or CV/gate using a controller device. Synthesizers use various methods to generate electronic signals, synthesizers were first used in pop music in the 1960s. In the 1970s, synths were used in disco, especially in the late 1970s, in the 1980s, the invention of the relatively inexpensive, mass market Yamaha DX7 synth made synthesizers widely available. 1980s pop and dance music often made use of synthesizers. In the 2010s, synthesizers are used in genres of pop, rock. Contemporary classical music composers from the 20th and 21st century write compositions for synthesizer, the beginnings of the synthesizer are difficult to trace, as it is difficult to draw a distinction between synthesizers and some early electric or electronic musical instruments. One of the earliest electric musical instruments, the telegraph, was invented in 1876 by American electrical engineer Elisha Gray. He accidentally discovered the sound generation from a self-vibrating electromechanical circuit and this musical telegraph used steel reeds with oscillations created by electromagnets transmitted over a telegraph line. Gray also built a simple loudspeaker device into later models, consisting of a diaphragm in a magnetic field. This instrument was a remote electromechanical musical instrument that used telegraphy, though it lacked an arbitrary sound-synthesis function, some have erroneously called it the first synthesizer. In 1897, Thaddeus Cahill invented the Teleharmonium, which used dynamos, and was capable of additive synthesis like the Hammond organ, however, Cahills business was unsuccessful for various reasons, and similar but more compact instruments were subsequently developed, such as electronic and tonewheel organs. In 1906, American engineer, Lee De Forest ushered in the electronics age and he invented the first amplifying vacuum tube, called the Audion tube. This led to new entertainment technologies, including radio and sound films, ondes Martenot and Trautonium were continuously developed for several decades, finally developing qualities similar to later synthesizers. In the 1920s, Arseny Avraamov developed various systems of graphic sonic art, in 1938, USSR engineer Yevgeny Murzin designed a compositional tool called ANS, one of the earliest real-time additive synthesizers using optoelectronics. The earliest polyphonic synthesizers were developed in Germany and the United States, during the three years that Hammond manufactured this model,1,069 units were shipped, but production was discontinued at the start of World War II. Both instruments were the forerunners of the electronic organs and polyphonic synthesizers
6.
Saxophone
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The saxophone is a family of woodwind instruments. Saxophones are usually made of brass and played with a single-reed mouthpiece similar to that of the clarinet, the saxophone family was invented by the Belgian instrument maker Adolphe Sax in 1840. He patented the saxophone on June 28,1846, in two groups of seven instruments each, each series consisted of instruments of various sizes in alternating transposition. The series pitched in B♭ and E♭, designed for bands, have proved extremely popular. The saxophone is used in music, military bands, marching bands. The saxophone was developed in 1846 by Adolphe Sax, a Belgian instrument maker, flautist, born in Dinant and originally based in Brussels, he moved to Paris in 1842 to establish his musical instrument business. Prior to his work on the saxophone, he had several improvements to the bass clarinet by improving its keywork and acoustics. Sax was also a maker of the ophicleide, a large conical brass instrument in the bass register with keys similar to a woodwind instrument. His experience with two instruments allowed him to develop the skills and technologies needed to make the first saxophones. As an outgrowth of his work improving the bass clarinet, Sax began developing an instrument with the projection of a brass instrument and he wanted it to overblow at the octave, unlike the clarinet, which rises in pitch by a twelfth when overblown. An instrument that overblows at the octave has identical fingering for both registers, Sax created an instrument with a single-reed mouthpiece like a clarinet, conical brass body like an ophicleide, and some acoustic properties of both the horn and the clarinet. Having constructed saxophones in several sizes in the early 1840s, Sax applied for, and received, the patent encompassed 14 versions of the fundamental design, split into two categories of seven instruments each, and ranging from sopranino to contrabass. Although the instruments transposed at either F or C have been considered orchestral, the C soprano saxophone was the only instrument to sound at concert pitch. Saxs patent expired in 1866, thereafter, numerous saxophonists and instrument manufacturers implemented their own improvements to the design, the first substantial modification was by a French manufacturer who extended the bell slightly and added an extra key to extend the range downwards by one semitone to B♭. It is suspected that Sax himself may have attempted this modification and this extension is now commonplace in almost all modern designs, along with other minor changes such as added keys for alternate fingerings. Using alternate fingerings allows a player to play faster and more easily, a player may also use alternate fingerings to bend the pitch. Some of the alternate fingerings are good for trilling, scales, a substantial advancement in saxophone keywork was the development of a method by which the left thumb operates both tone holes with a single octave key, which is now universal on modern saxophones. This enables a chromatic scale to be played two octaves simply by playing the diatonic scale combined with alternately raising and lowering this one digit
7.
Trombone
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The trombone is a musical instrument in the brass family. Like all brass instruments, sound is produced when the players vibrating lips cause the air column inside the instrument to vibrate, nearly all trombones have a telescoping slide mechanism that varies the length of the instrument to change the pitch. Many modern trombone models also utilize a rotary valve as a means to lower pitch of the instrument, variants such as the valve trombone and superbone have three valves like those on the trumpet. The word trombone derives from Italian tromba and -one, so the name means large trumpet, the trombone has a predominantly cylindrical bore like its valved counterpart the baritone and in contrast to its conical valved counterparts, the euphonium and the horn. The most frequently encountered trombones are the trombone and bass trombone. The most common variant, the tenor, is an instrument pitched in B♭, an octave below the B♭ trumpet. A person who plays the trombone is called a trombonist or trombone player, the trombone is a predominantly cylindrical tube bent into an elongated S shape. Rather than being completely cylindrical from end to end, the tube is a series of tapers with the smallest at the mouthpiece receiver. The design of these affects the intonation of the instrument. As with other instruments, sound is produced by blowing air through pursed lips producing a vibration that creates a standing wave in the instrument. The detachable cup-shaped mouthpiece is similar to that of the baritone horn and it has the venturi, a small constriction of the air column that adds resistance greatly affecting the tone of the instrument, and is inserted into the mouthpiece receiver in the slide section. The slide section consists of a leadpipe, the inner and outer tubes. Modern stays are soldered, while sackbuts were made with loose, the slide, the most distinctive feature of the trombone, allows the player to extend the length of the air column, lowering the pitch. To prevent friction from slowing the action of the slide, additional sleeves were developed during the Renaissance, and this part of the slide must be lubricated frequently. Additional tubing connects the slide to the bell of the instrument through a neckpipe, for example, second position A is not in exactly the same place on the slide as second position E. Many types of trombone also include one or more rotary valves used to increase the length of the instrument by directing the air flow through additional tubing. This allows the instrument to reach notes that are not possible without the valve as well as play other notes in alternate positions. Like the trumpet, the trombone is considered a cylindrical bore instrument since it has sections of tubing, principally in the slide section
8.
Bass guitar
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The bass guitar is a stringed instrument played primarily with the fingers or thumb, by plucking, slapping, popping, strumming, tapping, thumping, or picking with a plectrum, often known as a pick. The bass guitar is similar in appearance and construction to a guitar, but with a longer neck and scale length. The four-string bass, by far the most common, is tuned the same as the double bass. The bass guitar is an instrument, as it is notated in bass clef an octave higher than it sounds to avoid excessive ledger lines. Like the electric guitar, the guitar has pickups and it is plugged into an amplifier and speaker on stage, or into a larger PA system using a DI unit. Since the 1960s, the guitar has largely replaced the double bass in popular music as the bass instrument in the rhythm section. While types of basslines vary widely from one style of music to another, many styles of music utilise the bass guitar, including rock, heavy metal, pop, punk rock, country, reggae, gospel, blues, symphonic rock, and jazz. It is often a solo instrument in jazz, jazz fusion, Latin, funk, progressive rock and other rock, the adoption of a guitar form made the instrument easier to hold and transport than any of the existing stringed bass instruments. The addition of frets enabled bassists to play in more easily than on acoustic or electric upright basses. Around 100 of these instruments were made during this period, around 1947, Tutmarcs son, Bud, began marketing a similar bass under the Serenader brand name, prominently advertised in the nationally distributed L. D. Heater Music Company wholesale jobber catalogue of 1948, however, the Tutmarc family inventions did not achieve market success. In the 1950s, Leo Fender, with the help of his employee George Fullerton and his Fender Precision Bass, which began production in October 1951, became a widely copied industry standard. This split pickup, introduced in 1957, appears to have been two mandolin pickups, the pole pieces and leads of the coils were reversed with respect to each other, producing a humbucking effect. Humbucking is a design that electrically cancels the effect of any AC hum, the Fender Bass was a revolutionary new instrument, which could be easily transported, and which was less prone to feedback when amplified than acoustic bass instruments. Monk Montgomery was the first bass player to tour with the Fender bass guitar, roy Johnson, and Shifty Henry with Louis Jordan & His Tympany Five, were other early Fender bass pioneers. Bill Black, playing with Elvis Presley, switched from bass to the Fender Precision Bass around 1957. The bass guitar was intended to appeal to guitarists as well as upright bass players, following Fenders lead, in 1953, Gibson released the first short scale violin-shaped electric bass with extendable end pin, allowing it to be played upright or horizontally. In 1959 these were followed by the more conventional-looking EB-0 Bass, the EB-0 was very similar to a Gibson SG in appearance
9.
Drum kit
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A drum kit consists of a mix of drums and idiophones most significantly cymbals but also including the woodblock and cowbell. In the 2000s, some also include electronic instruments and both hybrid and entirely electronic kits are used. If some or all of them are replaced by electronic drums, the drum kit is usually played while seated on a drum stool or throne. The drum kit differs from instruments that can be used to produce pitched melodies or chords, even though drums are often placed musically alongside others that do, such as the piano or guitar. The drum kit is part of the rhythm section used in many types of popular and traditional music styles ranging from rock and pop to blues. Other standard instruments used in the section include the electric bass, electric guitar. Many drummers extend their kits from this pattern, adding more drums, more cymbals. Some performers, such as some rockabilly drummers, use small kits that omit elements from the basic setup, some drum kit players may have other roles in the band, such as providing backup vocals, or less commonly, lead vocals. Thus, in an early 1800s orchestra piece, if the called for bass drum, triangle and cymbals. In the 1840s, percussionists began to experiment with foot pedals as a way to them to play more than one instrument. In the 1860s, percussionists started combining multiple drums into a set, the bass drum, snare drum, cymbals, and other percussion instruments were all played using hand-held drum sticks. Double-drumming was developed to one person to play the bass and snare with sticks. With this approach, the drum was usually played on beats one. This resulted in a swing and dance feel. The drum set was referred to as a trap set. By the 1870s, drummers were using an overhang pedal, most drummers in the 1870s preferred to do double drumming without any pedal to play multiple drums, rather than use an overhang pedal. Companies patented their pedal systems such as Dee Dee Chandler of New Orleans 1904–05, liberating the hands for the first time, this evolution saw the bass drum played with the foot of a standing percussionist. The bass drum became the central piece around which every other percussion instrument would later revolve and it was the golden age of drum building for many famous drum companies, with Ludwig introducing
10.
Record producer
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A record producer or music producer oversees and manages the sound recording and production of a band or performers music, which may range from recording one song to recording a lengthy concept album. A producer has many roles during the recording process, the roles of a producer vary. The producer may perform these roles himself, or help select the engineer, the producer may also pay session musicians and engineers and ensure that the entire project is completed within the record companies budget. A record producer or music producer has a broad role in overseeing and managing the recording. Producers also often take on an entrepreneurial role, with responsibility for the budget, schedules, contracts. In the 2010s, the industry has two kinds of producers with different roles, executive producer and music producer. Executive producers oversee project finances while music producers oversee the process of recording songs or albums. In most cases the producer is also a competent arranger, composer. The producer will also liaise with the engineer who concentrates on the technical aspects of recording. Noted producer Phil Ek described his role as the person who creatively guides or directs the process of making a record, indeed, in Bollywood music, the designation actually is music director. The music producers job is to create, shape, and mold a piece of music, at the beginning of record industry, producer role was technically limited to record, in one shot, artists performing live. The role of producers changed progressively over the 1950s and 1960s due to technological developments, the development of multitrack recording caused a major change in the recording process. Before multitracking, all the elements of a song had to be performed simultaneously, all of these singers and musicians had to be assembled in a large studio and the performance had to be recorded. As well, for a song that used 20 instruments, it was no longer necessary to get all the players in the studio at the same time. Examples include the rock sound effects of the 1960s, e. g. playing back the sound of recorded instruments backwards or clanging the tape to produce unique sound effects. These new instruments were electric or electronic, and thus they used instrument amplifiers, new technologies like multitracking changed the goal of recording, A producer could blend together multiple takes and edit together different sections to create the desired sound. For example, in jazz fusion Bandleader-composer Miles Davis album Bitches Brew, producers like Phil Spector and George Martin were soon creating recordings that were, in practical terms, almost impossible to realise in live performance. Producers became creative figures in the studio, other examples of such engineers includes Joe Meek, Teo Macero, Brian Wilson, and Biddu
11.
Singing
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Singing is the act of producing musical sounds with the voice, and augments regular speech by the use of sustained tonality, rhythm, and a variety of vocal techniques. A person who sings is called a singer or vocalist, Singers perform music that can be sung with or without accompaniment by musical instruments. Singing is often done in an ensemble of musicians, such as a choir of singers or a band of instrumentalists, Singers may perform as soloists, or accompanied by anything from a single instrument up to a symphony orchestra or big band. Singing can be formal or informal, arranged or improvised and it may be done as a form of religious devotion, as a hobby, as a source of pleasure, comfort, or ritual, as part of music education, or as a profession. Excellence in singing requires time, dedication, instruction, and regular practice, if practice is done on a regular basis then the sounds can become more clear and strong. Professional singers usually build their careers around one specific genre, such as classical or rock. They typically take voice training provided by teachers or vocal coaches throughout their careers. Though these four mechanisms function independently, they are coordinated in the establishment of a vocal technique and are made to interact upon one another. During passive breathing, air is inhaled with the diaphragm while exhalation occurs without any effort, exhalation may be aided by the abdominal, internal intercostal and lower pelvis/pelvic muscles. Inhalation is aided by use of external intercostals, scalenes and sternocleidomastoid muscles, the pitch is altered with the vocal cords. With the lips closed, this is called humming, humans have vocal folds which can loosen, tighten, or change their thickness, and over which breath can be transferred at varying pressures. The shape of the chest and neck, the position of the tongue, any one of these actions results in a change in pitch, volume, timbre, or tone of the sound produced. Sound also resonates within different parts of the body and an individuals size, Singers can also learn to project sound in certain ways so that it resonates better within their vocal tract. This is known as vocal resonation, another major influence on vocal sound and production is the function of the larynx which people can manipulate in different ways to produce different sounds. These different kinds of function are described as different kinds of vocal registers. The primary method for singers to accomplish this is through the use of the Singers Formant and it has also been shown that a more powerful voice may be achieved with a fatter and fluid-like vocal fold mucosa. The more pliable the mucosa, the more efficient the transfer of energy from the airflow to the vocal folds, Vocal registration refers to the system of vocal registers within the voice. A register in the voice is a series of tones, produced in the same vibratory pattern of the vocal folds
12.
Audio engineer
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An audio engineer works on the recording, manipulating the record using equalization and electronic effects, mixing, reproduction, and reinforcement of sound. Audio engineers work on the. technical aspect of recording—the placing of microphones, pre-amp knobs, the physical recording of any project is done by an engineer. Many audio engineers creatively use technologies to produce sound for film, radio, television, music, electronic products and computer games. Audio engineers also set up, sound check and do live sound mixing using an audio console, research and development audio engineers invent new technologies, equipment and techniques, to enhance the process and art of audio engineering. They might also be referred to as acoustic engineers, audio engineers in research and development usually possess a bachelors degree, masters degree or higher qualification in acoustics, physics, computer science or another engineering discipline. They might work in consultancy, specializing in architectural acoustics. Alternatively they might work in companies, or other industries that need audio expertise. Some positions, such as faculty require a Doctor of Philosophy, in Germany a Toningenieur is an audio engineer who designs, builds and repairs audio systems. The listed subdisciplines are based on PACS coding used by the Acoustical Society of America with some revision, audio engineers develop algorithms to allow the electronic manipulation of audio signals. These can be processed at the heart of audio production such as reverberation. Alternatively, the algorithms might carry out echo cancellation on Skype, or identify, architectural acoustics is the science and engineering of achieving a good sound within a room. For audio engineers, architectural acoustics can be about achieving good speech intelligibility in a stadium or enhancing the quality of music in a theatre, architectural Acoustic design is usually done by acoustic consultants. Electroacoustics is concerned with the design of headphones, microphones, loudspeakers, sound reproduction systems, examples of electroacoustic design include portable electronic devices, sound systems in architectural acoustics, surround sound in movie theater and vehicle audio. Musical acoustics is concerned with researching and describing the science of music, in audio engineering, this includes the design of electronic instruments such as synthesizers, the human voice, computer analysis of audio, music therapy, and the perception and cognition of music. Psychoacoustics is the study of how humans respond to what they hear. At the heart of audio engineering are listeners who are the final arbitrator as to whether a design is successful. The production, computer processing and perception of speech is an important part of audio engineering, ensuring speech is transmitted intelligibly, efficiently and with high quality, in rooms, through public address systems and through mobile telephone systems are important areas of study. Producer, engineer, and mixer Phil Ek has described audio engineering as the aspect of recording—the placing of microphones, the turning of pre-amp knobs
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