1.
Opera
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Opera is an art form in which singers and musicians perform a dramatic work combining text and musical score, usually in a theatrical setting. In traditional opera, singers do two types of singing, recitative, a style and arias, a more melodic style. Opera incorporates many of the elements of theatre, such as acting, scenery. The performance is given in an opera house, accompanied by an orchestra or smaller musical ensemble. Opera is a key part of the Western classical music tradition, in the 18th century, Italian opera continued to dominate most of Europe, attracting foreign composers such as George Frideric Handel. Opera seria was the most prestigious form of Italian opera, until Christoph Willibald Gluck reacted against its artificiality with his operas in the 1760s. The first third of the 19th century saw the point of the bel canto style, with Gioachino Rossini, Gaetano Donizetti. It also saw the advent of Grand Opera typified by the works of Auber and Meyerbeer, the mid-to-late 19th century was a golden age of opera, led and dominated by Richard Wagner in Germany and Giuseppe Verdi in Italy. The popularity of opera continued through the era in Italy and contemporary French opera through to Giacomo Puccini. During the 19th century, parallel operatic traditions emerged in central and eastern Europe, the 20th century saw many experiments with modern styles, such as atonality and serialism, Neoclassicism, and Minimalism. With the rise of recording technology, singers such as Enrico Caruso, since the invention of radio and television, operas were also performed on these mediums. Beginning in 2006, a number of opera houses began to present live high-definition video transmissions of their performances in cinemas all over the world. In 2009, an opera company offered a download of a complete performance. The words of an opera are known as the libretto, some composers, notably Wagner, have written their own libretti, others have worked in close collaboration with their librettists, e. g. Mozart with Lorenzo Da Ponte. Vocal duets, trios and other ensembles often occur, and choruses are used to comment on the action, in some forms of opera, such as singspiel, opéra comique, operetta, and semi-opera, the recitative is mostly replaced by spoken dialogue. Melodic or semi-melodic passages occurring in the midst of, or instead of, the terminology of the various kinds of operatic voices is described in detail below. Over the 18th century, arias were accompanied by the orchestra. Subsequent composers have tended to follow Wagners example, though some, the changing role of the orchestra in opera is described in more detail below
2.
Composer
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A composer is a person who creates or writes music, which can be vocal music, instrumental music or music which combines both instruments and voices. The core meaning of the term refers to individuals who have contributed to the tradition of Western classical music through creation of works expressed in written musical notation, many composers are also skilled performers, either as singers, instrumentalists, and/or conductors. Examples of composers who are well known for their ability as performers include J. S. Bach, Mozart. In many popular genres, such as rock and country. For a singer or instrumental performer, the process of deciding how to perform music that has previously composed and notated is termed interpretation. Different performers interpretations of the work of music can vary widely, in terms of the tempos that are chosen. Composers and songwriters who present their own music are interpreting, just as much as those who perform the music of others, although a musical composition often has a single author, this is not always the case. A piece of music can also be composed with words, images, or, in the 20th and 21st century, a culture eventually developed whereby faithfulness to the composers written intention came to be highly valued. This musical culture is almost certainly related to the esteem in which the leading classical composers are often held by performers. The movement might be considered a way of creating greater faithfulness to the original in works composed at a time that expected performers to improvise. In Classical music, the composer typically orchestrates her own compositions, in some cases, a pop songwriter may not use notation at all, and instead compose the song in her mind and then play or record it from memory. In jazz and popular music, notable recordings by influential performers are given the weight that written scores play in classical music. The level of distinction between composers and other musicians varies, which issues such as copyright and the deference given to individual interpretations of a particular piece of music. In the development of European classical music, the function of composing music initially did not have greater importance than that of performing it. The preservation of individual compositions did not receive attention and musicians generally had no qualms about modifying compositions for performance. In as much as the role of the composer in western art music has seen continued solidification, for instance, in certain contexts the line between composer and performer, sound designer, arranger, producer, and other roles, can be quite blurred. The term composer is often used to refer to composers of music, such as those found in classical, jazz or other forms of art. In popular and folk music, the composer is usually called a songwriter and this is distinct from a 19th-century conception of instrumental composition, where the work was represented solely by a musical score to be interpreted by performers
3.
Libretto
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A libretto is the text used in, or intended for, an extended musical work such as an opera, operetta, masque, oratorio, cantata or musical. The term libretto is also used to refer to the text of major liturgical works, such as the Mass, requiem and sacred cantata. Libretto, from Italian, is the diminutive of the word libro, sometimes other language equivalents are used for libretti in that language, livret for French works and Textbuch for German. A libretto is distinct from a synopsis or scenario of the plot, in that the libretto contains all the words and stage directions, while a synopsis summarizes the plot. The relationship of the librettist to the composer in the creation of a work has varied over the centuries, as have the sources. In the context of a modern English language musical theatre piece, Libretti for operas, oratorios and cantatas in the 17th and 18th centuries generally were written by someone other than the composer, often a well-known poet. Metastasio was one of the most highly regarded librettists in Europe and his libretti were set many times by many different composers. Another noted 18th-century librettist was Lorenzo Da Ponte, who wrote the libretti for three of Mozarts greatest operas, as well as for other composers. Eugène Scribe was one of the most prolific librettists of the 19th century, providing the words for works by Meyerbeer, Auber, Bellini, Donizetti, Rossini and Verdi. The French writers duo Henri Meilhac and Ludovic Halévy wrote a number of opera and operetta libretti for the likes of Jacques Offenbach, Jules Massenet. Arrigo Boito, who wrote libretti for, among others, Giuseppe Verdi and Amilcare Ponchielli, the libretto is not always written before the music. Some composers wrote their own libretti, Richard Wagner is perhaps most famous in this regard, with his transformations of Germanic legends and events into epic subjects for his operas and music dramas. Hector Berlioz, too, wrote the libretti for two of his works, La Damnation de Faust and Les Troyens. Alban Berg adapted Georg Büchners play Woyzeck for the libretto of Wozzeck, sometimes the libretto is written in close collaboration with the composer, this can involve adaptation, as was the case with Rimsky-Korsakov and his librettist Belsky, or an entirely original work. In the case of musicals, the music, the lyrics, thus, a musical such as Fiddler on the Roof has a composer, a lyricist and the writer of the book. In rare cases, the composer writes everything except the dance arrangements - music, lyrics and libretto, Other matters in the process of developing a libretto parallel those of spoken dramas for stage or screen. A famous case of the latter is Wagners 1861 revision of the original 1845 Dresden version of his opera Tannhäuser for Paris, since the late 19th century some opera composers have written music to prose or free verse libretti. The libretto of a musical, on the hand, is almost always written in prose
4.
Trumpet
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A trumpet is a musical instrument commonly used in classical and jazz ensembles. The trumpet group contains the instruments with the highest register in the brass family, trumpets are used in art music styles, for instance in orchestras, concert bands, and jazz ensembles, as well as in popular music. They are played by blowing air through almost-closed lips, producing a sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, there are many distinct types of trumpet, with the most common being pitched in B♭, having a tubing length of about 1.48 m. Early trumpets did not provide means to change the length of tubing, most trumpets have valves of the piston type, while some have the rotary type. The use of rotary-valved trumpets is more common in orchestral settings, each valve, when engaged, increases the length of tubing, lowering the pitch of the instrument. A musician who plays the trumpet is called a trumpet player or trumpeter, the earliest trumpets date back to 1500 BC and earlier. The bronze and silver trumpets from Tutankhamuns grave in Egypt, bronze lurs from Scandinavia, trumpets from the Oxus civilization of Central Asia have decorated swellings in the middle, yet are made out of one sheet of metal, which is considered a technical wonder. The Shofar, made from a ram horn and the Hatzotzeroth and they were played in Solomons Temple around 3000 years ago. They were said to be used to blow down the walls of Jericho and they are still used on certain religious days. The Salpinx was a straight trumpet 62 inches long, made of bone or bronze, Salpinx contests were a part of the original Olympic Games. The Moche people of ancient Peru depicted trumpets in their art going back to AD300, the earliest trumpets were signaling instruments used for military or religious purposes, rather than music in the modern sense, and the modern bugle continues this signaling tradition. Improvements to instrument design and metal making in the late Middle Ages, the natural trumpets of this era consisted of a single coiled tube without valves and therefore could only produce the notes of a single overtone series. Changing keys required the player to change crooks of the instrument, the development of the upper, clarino register by specialist trumpeters—notably Cesare Bendinelli—would lend itself well to the Baroque era, also known as the Golden Age of the natural trumpet. During this period, a vast body of music was written for virtuoso trumpeters, the art was revived in the mid-20th century and natural trumpet playing is again a thriving art around the world. The melody-dominated homophony of the classical and romantic periods relegated the trumpet to a role by most major composers owing to the limitations of the natural trumpet. Berlioz wrote in 1844, Notwithstanding the real loftiness and distinguished nature of its quality of tone, there are few instruments that have been more degraded. The attempt to give the trumpet more chromatic freedom in its range saw the development of the keyed trumpet, the symphonies of Mozart, Beethoven, and as late as Brahms, were still played on natural trumpets
5.
Clarinet
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The clarinet is a musical-instrument family belonging to the group known as the woodwind instruments. It has a mouthpiece, a straight cylindrical tube with an almost cylindrical bore. A person who plays a clarinet is called a clarinetist, the word clarinet may have entered the English language via the French clarinette, or from Provençal clarin, oboe. It would seem however that its roots are to be found amongst some of the various names for trumpets used around the renaissance. Clarion, clarin and the Italian clarino are all derived from the medieval term claro which referred to a form of trumpet. This is probably the origin of the Italian clarinetto, itself a diminutive of clarino, according to Johann Gottfried Walther, writing in 1732, the reason for the name is that it sounded from far off not unlike a trumpet. The English form clarinet is found as early as 1733, while the similarity in sound between the earliest clarinets and the trumpet may hold a clue to its name, other factors may have been involved. The trumpet parts that required this speciality were known by the term clarino, Johann Christoph Denner is generally believed to have invented the clarinet in Germany around the year 1700 by adding a register key to the earlier chalumeau. Over time, additional keywork and airtight pads were added to improve the tone and these days the most popular clarinet is the B♭ clarinet. However, the clarinet in A, just a lower, is commonly used in orchestral music. Since the middle of the 19th century the clarinet has become an essential addition to the orchestra. The clarinet family ranges from the BBB♭ octo-contrabass to the A♭ piccolo clarinet, the clarinet has proved to be an exceptionally flexible instrument, equally at home in the classical repertoire as in concert bands, military bands, marching bands, klezmer, and jazz. The cylindrical bore is primarily responsible for the clarinets distinctive timbre, the tone quality can vary greatly with the musician, the music, the instrument, the mouthpiece, and the reed. The most prominent were the German/Viennese traditions and the French school, the latter was centered on the clarinetists of the Conservatoire de Paris. The proliferation of recorded music has made examples of different styles of clarinet playing available, the modern clarinetist has a diverse palette of acceptable tone qualities to choose from. The A clarinet and B♭ clarinet have nearly the same bore, orchestral players using the A and B♭ instruments in the same concert could use the same mouthpiece for both. The A and the B♭ instruments have nearly identical tonal quality, the tone of the E♭ clarinet is brighter than that of the lower clarinets and can be heard even through loud orchestral or concert band textures. The bass clarinet has a deep, mellow sound, while the alto clarinet is similar in tone to the bass
6.
Viola
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The viola is a string instrument that is bowed or played with varying techniques. It is slightly larger than a violin and has a lower and deeper sound. Since the 18th century it has been the middle or alto voice of the family, between the violin and the cello. The strings from low to high are generally tuned to C3, G3, D4. In the past, the viola varied in size and style as did its names, the Italians often used the term, viola da braccio meaning literally, of the arm. Brazzo was another Italian word referring to the viola which the Germans adopted in the form, the French had their own names, Cinquiesme was a small viola, Haute Contre was a large viola and Taile meant Tenor. In the modern era, the French use the term Alto, the viola had enjoyed popularity in the heyday of five-part harmony up until the eighteenth century, taking three lines of the harmony and occasionally playing the melody line. Music that is written for the viola differs from that of most other instruments in that it uses the alto clef. Viola music switches to the treble clef when there are sections of music written in a higher register to make the notes easier to read. The viola often plays the voices in string quartets and symphonic writing. The viola occasionally plays a major, soloistic role in orchestral music, examples include Don Quixote by Richard Strauss and Harold en Italie by Hector Berlioz. In the earlier part of the 20th century, more composers began to write for the viola, encouraged by the emergence of specialized soloists such as Lionel Tertis and William Primrose. English composers Arthur Bliss, York Bowen, Benjamin Dale, Frank Bridge, Benjamin Britten and Ralph Vaughan Williams all wrote substantial chamber, many of these pieces were commissioned by, or written for Lionel Tertis. William Walton, Bohuslav Martinů, Toru Takemitsu, Tibor Serly, Alfred Schnittke, Paul Hindemith wrote a substantial amount of music for viola, including the concerto Der Schwanendreher. The concerti by Paul Hindemith, Béla Bartók, and William Walton are the big three of viola repertoire, the viola is similar in material and construction to the violin. A full-size violas body is between 25 mm and 100 mm longer than the body of a violin, with an average length of 41 cm. Small violas typically made for children typically start at 30 cm, for a child who needs a smaller size, a fractional-sized violin is often strung with the strings of a viola. Unlike the violin, the viola does not have a full size. The body of a viola would need to measure about 51 cm long to match the acoustics of a violin, there have been several experiments intended to increase the size of the viola, in the interest of improving the instruments sound
7.
Bassoon
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The bassoon is a woodwind instrument in the double reed family that typically plays music written in the bass and tenor clefs, and occasionally the treble. Appearing in its form in the 19th century, the bassoon figures prominently in orchestral, concert band. The bassoon is an instrument known for its distinctive tone color, wide range, variety of character. Listeners often compare its warm, dark, reedy timbre to that of a baritone voice. Someone who plays the bassoon is called a bassoonist, the word bassoon comes from French basson and from Italian bassone. However, the Italian name for the instrument is fagotto. B♭1–C5 The range of the bassoon begins at B♭1 and extends upward over three octaves, roughly to the G above the treble staff, higher notes are possible but difficult to produce, and rarely called for, orchestral and concert band parts rarely go higher than C5 or D5. Even Stravinskys famously difficult opening solo in The Rite of Spring only ascends to D5, a1 is possible with a special extension to the instrument—see Extended techniques below. The bassoon disassembles into six pieces, including the reed. Bassoons are double reed instruments like the oboe and the English horn, a modern beginners bassoon is generally made of maple, with medium-hardness types such as sycamore maple and sugar maple preferred. Both bore and tone holes are precision-machined, and each instrument is finished by hand for proper tuning and this ensures coverage by the fingers of the average adult hand. Wooden instruments are lined with hard rubber along the interior of the wing and boot joints to prevent damage from moisture, the end of the bell is usually fitted with a ring, either of metal, plastic or ivory. The joints between sections consist of a tenon fitting into a socket, the tenons are wrapped in either cork or string as a seal against air leaks. The bocal connects the reed to the rest of the instrument and is inserted into a socket at the top of the wing joint, bocals come in many different lengths and styles, depending on the desired tuning and playing characteristics. Folded upon itself, the bassoon stands 1.34 m tall, there are also short-reach bassoons made for the benefit of young or petite players. The origins of the dulcian are obscure, but by the century it was available in as many as eight different sizes. Otherwise, dulcian technique was rather primitive, with eight finger holes, the dulcian came to be known as fagotto in Italy. However, the etymology that equates fagotto with bundle of sticks is somewhat misleading
8.
Piano
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The piano is an acoustic, stringed musical instrument invented around the year 1700, in which the strings are struck by hammers. It is played using a keyboard, which is a row of keys that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings. The word piano is a form of pianoforte, the Italian term for the early 1700s versions of the instrument. The first fortepianos in the 1700s had a sound and smaller dynamic range. An acoustic piano usually has a wooden case surrounding the soundboard and metal strings. Pressing one or more keys on the keyboard causes a padded hammer to strike the strings. The hammer rebounds from the strings, and the continue to vibrate at their resonant frequency. These vibrations are transmitted through a bridge to a soundboard that amplifies by more efficiently coupling the acoustic energy to the air, when the key is released, a damper stops the strings vibration, ending the sound. Notes can be sustained, even when the keys are released by the fingers and thumbs and this means that the piano can play 88 different pitches, going from the deepest bass range to the highest treble. The black keys are for the accidentals, which are needed to play in all twelve keys, more rarely, some pianos have additional keys. Most notes have three strings, except for the bass that graduates from one to two, the strings are sounded when keys are pressed or struck, and silenced by dampers when the hands are lifted from the keyboard. There are two types of piano, the grand piano and the upright piano. The grand piano is used for Classical solos, chamber music and art song and it is used in jazz. The upright piano, which is compact, is the most popular type, as they are a better size for use in private homes for domestic music-making. During the nineteenth century, music publishers produced many works in arrangements for piano, so that music lovers could play. The piano is widely employed in classical, jazz, traditional and popular music for solo and ensemble performances, accompaniment, with technological advances, amplified electric pianos, electronic pianos, and digital pianos have also been developed. The electric piano became an instrument in the 1960s and 1970s genres of jazz fusion, funk music. The piano was founded on earlier technological innovations in keyboard instruments, pipe organs have been used since Antiquity, and as such, the development of pipe organs enabled instrument builders to learn about creating keyboard mechanisms for sounding pitches
9.
Conducting
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Conducting is the art of directing a musical performance, such as an orchestral or choral concert. A conductors directions will almost invariably be supplemented or reinforced by verbal instructions or suggestions to their musicians in rehearsal prior to a performance. The conductor typically stands on a podium with a large music stand for the full score. Conducting while playing a piano or synthesizer may also be done with musical theatre pit orchestras, communication is typically non-verbal during a performance. However, in rehearsals, frequent interruptions allow the conductor to give verbal directions as to how the music should be played or sung, Conductors act as guides to the orchestras or choirs they conduct. They choose the works to be performed and study their scores, to which they may make adjustments, work out their interpretation. They may also attend to matters, such as scheduling rehearsals, planning a concert season, hearing auditions and selecting members. Orchestras, choirs, concert bands and other musical ensembles such as big bands are usually led by conductors. The principal conductor of an orchestra or opera company is referred to as a music director or chief conductor, or by the German words Kapellmeister or Dirigent. Conductors of choirs or choruses are sometimes referred to as director, chorus master, or choirmaster. Conductors of concert bands, military bands, marching bands and other bands may hold the title of director, bandmaster. Respected senior conductors are sometimes referred to by the Italian word, an early form of conducting is cheironomy, the use of hand gestures to indicate melodic shape. This has been practiced at least as far back as the Middle Ages, in the 17th century, other devices to indicate the passing of time came into use. Rolled up sheets of paper, smaller sticks and unadorned hands are all shown in pictures from this period, the large staff was responsible for the death of Jean-Baptiste Lully, who injured his foot with one while conducting a Te Deum for the Kings recovery from illness. The wound became gangrenous and Lully refused amputation, whereupon the gangrene spread to his leg, in instrumental music throughout the 18th century, a member of the ensemble usually acted as the conductor. This was sometimes the concertmaster, who could use his bow as a baton and it was common to conduct from the harpsichord in pieces that had a basso continuo part. In opera performances, there were sometimes two conductors – the keyboard player was in charge of the singers, and the principal violinist or leader was in charge of the orchestra. By the early 19th century, it became the norm to have a dedicated conductor, the size of the usual orchestra expanded during this period, and the use of a baton became more common, as it was easier to see than bare hands or rolled-up paper
10.
Jamaica Plain
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Jamaica Plain is a neighborhood of 4.4 square miles in Boston, Massachusetts, US. Founded by Boston Puritans seeking farm land to the south, it was part of the town of Roxbury. The community seceded from Roxbury as a part of the new town of West Roxbury in 1851, and became part of Boston when West Roxbury was annexed to Boston in 1874. In the 19th century, Jamaica Plain became one of the first streetcar suburbs in America and home to a significant portion of Bostons Emerald Necklace of parks, according to the 2010 Census, it had a population of 37,468. Shortly after the founding of Boston and Roxbury in 1630, William Heaths family, later, for services rendered during the Pequot War, Joseph Weld received a grant of 278 acres of land between South Street and Centre Street. His son John later built a home along South Street in what is now the Arnold Arboretum, in the late 17th century, the name Jamaica first appears for the area of Roxbury between Stony Brook and the Great Pond. There are a number of theories regarding the origin of the name Jamaica Plain, a well-known theory traces the origin to Jamaica rum, a reference to Jamaican cane sugars role in the Triangle Trade of sugar, rum, and slaves. However, a likely explanation is that Jamaica is an Anglicization of the name of Kuchamakin. On some maps, until the mid-19th century, the area was marked as Jamaica Plains, John Ruggles and Hugh Thomas donated land in 1676 for the building of the communitys first school. A gift of 75 acres of south of the Great Pond by John Eliot provided financial support for the school. During the 18th century, the farms of the Jamaica section of Roxbury transitioned from subsistence to market orientation, at the same time, wealthy men bought land and built estates in the bucolic countryside. In 1740, Benjamin Faneuil, nephew of Boston merchant Peter Faneuil, in 1752, Commodore Joshua Loring bought the old Polley farm and built a home to which he retired. At Jamaica Pond, the governor, Francis Bernard, built a summer home on 60 acres. In 1775, troops from Rhode Island and Connecticut were quartered with residents of Jamaica Plain, general Washington stationed troops on Weld Hill, todays Bussey Hill in the Arnold Arboretum. The units protected the south to Dedham, where the American arsenal was kept. With the American Revolution, many of the Tory estate owners fled the country, in 1777, John Hancock purchased an estate near the pond. The widow Ann Doane bought the estate owned by Loyalist Joshua Loring. She soon was remarried, to attorney David S. Greenough, when Samuel Adams became governor of Massachusetts, he bought the former Peacock Tavern at todays Centre and Allandale streets, near the Faulkner Hospital
11.
The Palm Beach Post
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The Palm Beach Post is an American daily newspaper serving Palm Beach County in South Florida, and the Treasure Coast area. As of 2012 it was the 80th largest daily newspaper in the United States, the Palm Beach Post began as The Palm Beach County, a weekly newspaper established in 1908. In January 1916, the became a daily, morning publication known as The Palm Beach Post. In 1934, Palm Beach businessman Edward R. Bradley bought The Palm Beach Post and The Palm Beach Times, in 1947, both were purchased by longtime resident John Holliday Perry, Sr. who owned a Florida newspaper chain of six dailies and 15 weeklies. In 1948, Perry purchased both the Palm Beach Daily News and the society magazine Palm Beach Life, in 1979, The Palm Beach Times was renamed The Evening Times. In 1987, The Evening Times merged with The Post to form a single newspaper, in 1989, all of neighboring sister publication Miami News assets and archives were merged with the Palm Beach Post upon the closure of that paper. In 1996, The Palm Beach Post sponsored Scripps National Spelling Bee winner Wendy Guey, Palm Beach Post photographer Dallas Kinney won the 1970 Pulitzer Prize for Feature Photography for his portfolio of pictures of Florida migrant workers, Migration to Misery. Post photographers have subsequently been Pulitzer finalists three times, Editor Edward Sears won the Editor of the Year award in 2004 from Editor & Publisher. Sears led the Post newsroom from 1985-2005, the Palm Beach Post has over 750,000 daily readers in print and online each week. Palm Beach Newspapers Inc. continues to publish The Palm Beach Post, Palm Beach Daily News, Florida Pennysaver and La Palma, each publication has a corresponding web site. The Post launched PBGametime. com, home for its coverage of Palm Beach County and Treasure Coast high school sports, like many newspapers throughout the country, the Post downsized its newsroom by more than 30 percent in 2008 and 2009. At the same time it closed its printing press, the Posts print edition is now printed in Broward County by the South Florida Sun-Sentinel and shipped north to Palm Beach County for daily distribution. As of 2012, the Posts average daily circulation was slightly over 88,000, well below daily circulation figures of around 165,000 at the turn of the century and it is the 80th largest daily newspaper in the United States and the 7th largest in Florida. List of newspapers in Florida Miami portal Journalism portal Official website
12.
Instant messaging
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Instant messaging is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a way over a local area network. Short messages are typically transmitted bi-directionally between two parties, when each user chooses to complete a thought and select send, some IM applications can use push technology to provide real-time text, which transmits messages character by character, as they are composed. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, non-IM types of chat include multicast transmission, usually referred to as chat rooms, where participants might be anonymous or might be previously known to each other. Instant messaging systems tend to facilitate connections between specified known users, depending on the IM protocol, the technical architecture can be peer-to-peer or client-server. Instant messaging is a set of technologies used for text-based communication between two or more participants over the Internet or other types of networks. Of importance is that online chat and instant messaging differ from other such as email due to the perceived quasi-synchrony of the communications by the users. Some systems permit messages to be sent to users not then logged on, IM allows effective and efficient communication, allowing immediate receipt of acknowledgment or reply. However IM is basically not necessarily supported by transaction control, in many cases, instant messaging includes added features which can make it even more popular. For example, users may see each other via webcams, or talk directly for free over the Internet using a microphone, many applications allow file transfers, although they are usually limited in the permissible file-size. It is usually possible to save a text conversation for later reference, Instant messages are often logged in a local message history, making it similar to the persistent nature of emails. Initially, some of these systems were used as notification systems for services like printing, as networks developed, the protocols spread with the networks. Some of these used a peer-to-peer protocol, while others required peers to connect to a server, the Zephyr Notification Service was invented at MITs Project Athena in the 1980s to allow service providers to locate and send messages to users. Parallel to instant messaging were early online chat facilities, the earliest of which was Talkomatic on the PLATO system, during the bulletin board system phenomenon that peaked during the 1980s, some systems incorporated chat features which were similar to instant messaging, Freelancin Roundtable was one prime example. The first such general-availability commercial online service was the CompuServe CB Simulator in 1980, created by CompuServe executive Alexander Sandy Trevor in Columbus. Early instant messaging programs were primarily real-time text, where appeared as they were typed. This includes the Unix talk command line program, which was popular in the 1980s, some BBS chat programs also used a similar interface. Modern implementations of real-time text also exist in instant messengers, such as AOLs Real-Time IM as an optional feature, (Quantum Link later became America Online and made AOL Instant Messenger
