Frequency is the number of occurrences of a repeating event per unit of time. It is referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency; the period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals, radio waves, light. For cyclical processes, such as rotation, oscillations, or waves, frequency is defined as a number of cycles per unit time. In physics and engineering disciplines, such as optics and radio, frequency is denoted by a Latin letter f or by the Greek letter ν or ν; the relation between the frequency and the period T of a repeating event or oscillation is given by f = 1 T.
The SI derived unit of frequency is the hertz, named after the German physicist Heinrich Hertz. One hertz means. If a TV has a refresh rate of 1 hertz the TV's screen will change its picture once a second. A previous name for this unit was cycles per second; the SI unit for period is the second. A traditional unit of measure used with rotating mechanical devices is revolutions per minute, abbreviated r/min or rpm. 60 rpm equals one hertz. As a matter of convenience and slower waves, such as ocean surface waves, tend to be described by wave period rather than frequency. Short and fast waves, like audio and radio, are described by their frequency instead of period; these used conversions are listed below: Angular frequency denoted by the Greek letter ω, is defined as the rate of change of angular displacement, θ, or the rate of change of the phase of a sinusoidal waveform, or as the rate of change of the argument to the sine function: y = sin = sin = sin d θ d t = ω = 2 π f Angular frequency is measured in radians per second but, for discrete-time signals, can be expressed as radians per sampling interval, a dimensionless quantity.
Angular frequency is larger than regular frequency by a factor of 2π. Spatial frequency is analogous to temporal frequency, but the time axis is replaced by one or more spatial displacement axes. E.g.: y = sin = sin d θ d x = k Wavenumber, k, is the spatial frequency analogue of angular temporal frequency and is measured in radians per meter. In the case of more than one spatial dimension, wavenumber is a vector quantity. For periodic waves in nondispersive media, frequency has an inverse relationship to the wavelength, λ. In dispersive media, the frequency f of a sinusoidal wave is equal to the phase velocity v of the wave divided by the wavelength λ of the wave: f = v λ. In the special case of electromagnetic waves moving through a vacuum v = c, where c is the speed of light in a vacuum, this expression becomes: f = c λ; when waves from a monochrome source travel from one medium to another, their frequency remains the same—only their wavelength and speed change. Measurement of frequency can done in the following ways, Calculating the frequency of a repeating event is accomplished by counting the number of times that event occurs within a specific time period dividing the count by the length of the time period.
For example, if 71 events occur within 15 seconds the frequency is: f = 71 15 s ≈ 4.73 Hz If the number of counts is not large, it is more accurate to measure the time interval for a predetermined number of occurrences, rather than the number of occurrences within a specified time. The latter method introduces a random error into the count of between zero and one count, so on average half a count; this is called gating error and causes an average error in the calculated frequency of Δ f = 1 2 T
Height above average terrain
Height above average terrain, or effective height above average terrain, is a measure of how high an antenna site is above the surrounding landscape. HAAT is used extensively in FM radio and television, as it is more important than effective radiated power in determining the range of broadcasts. For international coordination, it is measured in meters by the Federal Communications Commission in the United States, as Canada and Mexico have extensive border zones where stations can be received on either side of the international boundaries. Stations that want to increase above a certain HAAT must reduce their power accordingly, based on the maximum distance their station class is allowed to cover; the FCC procedure to calculate HAAT is: from the proposed or actual antenna site, either 12 or 16 radials were drawn, points at 2, 4, 6, 8, 10 miles radius along each radial were used. The entire radial graph could be rotated to achieve the best effect for the station; the altitude of the antenna site, minus the average altitude of all the specified points, is the HAAT.
This can create some unusual cases in mountainous regions—it is possible to have a negative number for HAAT. The FCC has divided the Contiguous United States into three zones for the determination of spacing between FM and TV stations using the same frequencies. FM and TV stations are assigned maximum ERP and HAAT values, depending on their assigned zones, to prevent co-channel interference; the FCC regulations for ERP and HAAT are listed under Title 47, Part 73 of the Code of Federal Regulations. Maximum HAAT: 150 metres Maximum ERP: 50 kilowatts Minimum co-channel separation: 241 km Maximum HAAT: 600 metres Maximum ERP: 100 kilowatts Minimum co-channel separation: 290 km. In all zones, maximum ERP for analog TV transmitters is. In addition, Zone I-A consists of all of California south of 40° north latitude, Puerto Rico and the U. S. Virgin Islands. Zones I and I-A have the most "grandfathered" overpowered stations, which are allowed the same extended coverage areas that they had before the zones were established.
One of the most powerful of these stations is WBCT in Grand Rapids, which operates at 320,000 watts and 238 meters HAAT. Zone III consists of all of Florida and the areas of Alabama, Louisiana and Texas within 241.4 kilometers of the Gulf of Mexico. Zone II is all the rest of the Continental United States and Hawaii. Above mean sea level Above ground level Canadian Radio-television and Telecommunications Commission List of broadcast station classes United States Federal Communications Commission 47 CFR Part 73 Index FCC: Mass Media Calculated Contours FCC: HAAT Calculator "Superpower" Grandfathered FM stations
Buffalo, New York
Buffalo is the second largest city in the U. S. state of New York and the largest city in Western New York. As of 2017, the population was 258,612; the city is the county seat of Erie County and a major gateway for commerce and travel across the Canada–United States border, forming part of the bi-national Buffalo Niagara Region. The Buffalo area was inhabited before the 17th century by the Native American Iroquois tribe and by French settlers; the city grew in the 19th and 20th centuries as a result of immigration, the construction of the Erie Canal and rail transportation, its close proximity to Lake Erie. This growth provided an abundance of fresh water and an ample trade route to the Midwestern United States while grooming its economy for the grain and automobile industries that dominated the city's economy in the 20th century. Since the city's economy relied on manufacturing, deindustrialization in the latter half of the 20th century led to a steady decline in population. While some manufacturing activity remains, Buffalo's economy has transitioned to service industries with a greater emphasis on healthcare and higher education, which emerged following the Great Recession.
Buffalo is on the eastern shore of Lake Erie, at the head of the Niagara River, 16 miles south of Niagara Falls. Its early embrace of electric power led to the nickname "The City of Light"; the city is famous for its urban planning and layout by Joseph Ellicott, an extensive system of parks designed by Frederick Law Olmsted, as well as significant architectural works. Its culture blends Northeastern and Midwestern traditions, with annual festivals including Taste of Buffalo and Allentown Art Festival, two professional sports teams, a music and arts scene; the city of Buffalo received its name from a nearby creek called Buffalo Creek. British military engineer Captain John Montresor made reference to "Buffalo Creek" in his 1764 journal, which may be the earliest recorded appearance of the name. There are several theories regarding. While it is possible its name originated from French fur traders and Native Americans calling the creek Beau Fleuve, it is possible Buffalo Creek was named after the American buffalo, whose historical range may have extended into western New York.
The first inhabitants of the State of New York are believed to have been nomadic Paleo-Indians, who migrated after the disappearance of Pleistocene glaciers during or before 7000 BCE. Around 1000 CE, 1,000 years ago, the Woodland period began, marked by the rise of the Iroquois Confederacy and its tribes throughout the state. During French exploration of the region in 1620, the region was occupied by the agrarian Erie people, a tribe outside of the Five Nations of the Iroquois southwest of Buffalo Creek, the Wenro people or Wenrohronon, an Iroquoian-speaking tribal offshoot of the large Neutral Nation who lived along the inland south shore of Lake Ontario and at the east end of Lake Erie and a bit of its northern shore. For trading, the Neutral people made a living by growing tobacco and hemp to trade with the Iroquois, utilizing animal paths or warpaths to travel and move goods across the state; these paths were paved, now function as major roads. During the Beaver Wars of the 1640s-1650s, the combined warriors of the Five Nations of the Iroquois Confederacy conquered the populous Neutrals and their peninsular territory, while the Senecas alone took out the Wenro and their territory, c.
1651–1653. Soon after, the Erie nation and territory was destroyed by the Iroquois over their assistance to Huron people during the Beaver Wars, it was Louis Hennepin and Sieur de La Salle who made the earliest European discoveries of the upper Niagara and Ontario regions in the late 1600s. On August 7, 1679, La Salle launched a vessel, Le Griffon, that became the first full-sized ship to sail across the Great Lakes disappearing in Green Bay, Wisconsin. After the American Revolution, the colony of New York—now a state—began westward expansion, looking for habitable land by following trends of the Iroquois. Land near fresh water was of considerable importance. New York and Massachusetts were fighting for the territory Buffalo lies on, Massachusetts had the right to purchase all but a one-mile wide portion of land; the rights to the Massachusetts' territories were sold to Robert Morris in 1791, two years to the Holland Land Company. As a result of the war, in which the Iroquois tribe sided with the British Army, Iroquois territory was whittled away in the mid-to-late-1700s by white settlers through successive treaties statewide, such as the Treaty of Fort Stanwix, the First Treaty of Buffalo Creek, the Treaty of Geneseo.
The Iroquois were corralled onto reservations, including Buffalo Creek. By the end of the 18th century, only 338 square miles of reservation territory remained. Early settlers along the mouth of Buffalo Creek were former slave Joseph "Black Joe" Hodges, Cornelius Winney, a Dutch trader from Albany who arrived in 1789; the first white settlers along the creek were prisoners captured during the Revolutionary War. The first resident and landowner of Buffalo with a permanent presence was Captain William Johnston, a white Iroquois interpreter, present in the area since the days after the Revolutionary War and was granted creekside land by the Senecas as a gift of appreciation, his house was built at present-day Seneca streets. On July 20, 1793, the Holland Land Purchase was completed, containing the land of present-day Buffalo, brokered by Dutch investors from Holland; the Treaty of Big Tree removed Iroquois title to lan
In broadcasting and radio communications, a call sign is a unique designation for a transmitter station. In the United States of America, they are used for all FCC-licensed transmitters. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or cryptographically encoded to disguise a station's identity; the use of call signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one telegraph line linking all railroad stations, there needed to be a way to address each one when sending a telegram. In order to save time, two-letter identifiers were adopted for this purpose; this pattern continued in radiotelegraph operation. These were not globally unique, so a one-letter company identifier was added. By 1912, the need to identify stations operated by multiple companies in multiple nations required an international standard. Merchant and naval vessels are assigned call signs by their national licensing authorities.
In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters. United States merchant vessels are given call signs beginning with the letters "W" or "K" while US naval ships are assigned call signs beginning with "N". Both ships and broadcast stations were assigned call signs in this series consisting of three or four letters. Ships equipped with Morse code radiotelegraphy, or life boat radio sets, Aviation ground stations, broadcast stations were given four letter call signs. Maritime coast stations on high frequency were assigned three letter call signs; as demand for both marine radio and broadcast call signs grew American-flagged vessels with radiotelephony only were given longer call signs with mixed letters and numbers. Leisure craft with VHF radios may not be assigned call signs, in which case the name of the vessel is used instead. Ships in the US still wishing to have a radio license are under FCC class SA: "Ship recreational or voluntarily equipped."
Those calls follow the land mobile format of the initial letter K or W followed by 1 or 2 letters followed by 3 or 4 numbers. U. S. Coast Guard small boats have a number, shown on both bows in which the first two digits indicate the nominal length of the boat in feet. For example, Coast Guard 47021 refers to the 21st in the series of 47-foot motor lifeboats; the call sign might be abbreviated to the final two or three numbers during operations, for example: Coast Guard zero two one. Aviation mobile stations equipped with radiotelegraphy were assigned five letter call signs.. Land Stations in Aviation were assigned four letter call signs; these call signs were phased out in the 1960s when flight radio officers were no longer required on international flights. USSR kept FRO's for the Moscow-Havana run until around 2000. All signs in aviation are derived from several different policies, depending upon the type of flight operation and whether or not the caller is in an aircraft or at a ground facility.
In most countries, unscheduled general aviation flights identify themselves using the call sign corresponding to the aircraft's registration number. In this case, the call sign is spoken using the International Civil Aviation Organization phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix, followed by a unique identifier made up of letters and numbers. For example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa. However, in the United States a pilot of an aircraft would omit saying November, instead use the name of the aircraft manufacturer or the specific model. At times, general aviation pilots might omit additional preceding numbers and use only the last three numbers and letters; this is true at uncontrolled fields when reporting traffic pattern positions or at towered airports after establishing two-way communication with the tower controller. For example, Skyhawk eight-Charlie-Papa, left base.
In most countries, the aircraft call sign or "tail number"/"tail letters" are linked to the international radio call sign allocation table and follow a convention that aircraft radio stations receive call signs consisting of five letters. For example, all British civil aircraft have a five-letter call sign beginning with the letter G. Canadian aircraft have a call sign beginning with C–F or C–G, such as C–FABC. Wing In Ground-effect vehicles in Canada are eligible to receive C–Hxxx call signs, ultralight aircraft receive C-Ixxx call signs. In days gone by American aircraft used five letter call signs, such as KH–ABC, but they were replaced prior to World War II by the current American system of civilian aircraft call signs. Radio call signs used for communication in manned spaceflight is not formalized or regulated to the same degree as for aircraft; the three nations curren
Albany, New York
Albany is the capital of the U. S. state of New York and the seat of Albany County. Albany is located on the west bank of the Hudson River 10 miles south of its confluence with the Mohawk River and 135 miles north of New York City. Albany is known for its rich history, culture and institutions of higher education. Albany constitutes the economic and cultural core of the Capital District of New York State, which comprises the Albany–Schenectady–Troy, NY Metropolitan Statistical Area, including the nearby cities and suburbs of Troy and Saratoga Springs. With a 2013 Census-estimated population of 1.1 million the Capital District is the third-most populous metropolitan region in the state. As of the 2010 census, the population of Albany was 97,856; the area that became Albany was settled by Dutch colonists who in 1614, built Fort Nassau for fur trading and, in 1624, built Fort Orange. In 1664, the English took over the Dutch settlements, renaming the city as Albany, in honor of the Duke of Albany, the future James II of England and James VII of Scotland.
The city was chartered in 1686 under English rule. It became the capital of New York in 1797 following formation of the United States. Albany is one of the oldest surviving settlements of the original British thirteen colonies, is the longest continuously chartered city in the United States. During the late 18th century and throughout most of the 19th, Albany was a center of trade and transportation; the city lies toward the north end of the navigable Hudson River, was the original eastern terminus of the Erie Canal connecting to the Great Lakes, was home to some of the earliest railroad systems in the world. In the 1920s, a powerful political machine controlled by the Democratic Party arose in Albany. In the latter part of the 20th century, Albany experienced a decline in its population due to urban sprawl and suburbanization. In the early 21st century, Albany has experienced growth in the high-technology industry, with great strides in the nanotechnology sector. Albany is one of the oldest surviving European settlements from the original thirteen colonies and the longest continuously chartered city in the United States.
The Hudson River area was inhabited by Algonquian-speaking Mohican, who called it Pempotowwuthut-Muhhcanneuw, meaning "the fireplace of the Mohican nation." Based to the west along the Mohawk River, the Iroquoian-speaking Mohawk referred to it as Sche-negh-ta-da, or "through the pine woods," referring to the path they took there. The Mohawk were one of the Five Nations of the Iroquois Confederacy, or Haudenosaunee, became strong trading partners with the Dutch and English, it is the Albany area was visited by European fur traders as early as 1540, but the extent and duration of those visits has not been determined. Permanent European claims began when Englishman Henry Hudson, exploring for the Dutch East India Company on the Half Moon, reached the area in 1609, claiming it for the United Netherlands. In 1614, Hendrick Christiaensen built Fort Nassau, a fur-trading post and the first documented European structure in present-day Albany. Commencement of the fur trade provoked hostility from the French colony in Canada and among the natives, all of whom vied to control the trade.
In 1618, a flood ruined the fort on Castle Island. Both forts were named in honor of the Dutch royal House of Orange-Nassau. Fort Orange and the surrounding area were incorporated as the village of Beverwijck in 1652. In these early decades of trade, the Dutch and Mohawk developed relations that reflected differences among their three cultures; when New Netherland was captured by the English in 1664, the name was changed from Beverwijck to Albany in honor of the Duke of Albany. Duke of Albany was a Scottish title given since 1398 to a younger son of the King of Scots; the name is derived from Alba, the Gaelic name for Scotland. The Dutch regained Albany in August 1673 and renamed the city Willemstadt. On November 1, 1683, the Province of New York was split into counties, with Albany County being the largest. At that time the county included all of present New York State north of Dutchess and Ulster Counties in addition to present-day Bennington County, theoretically stretching west to the Pacific Ocean.
Albany was formally chartered as a municipality by provincial Governor Thomas Dongan on July 22, 1686. The Dongan Charter was identical in content to the charter awarded to the city of New York three months earlier. Dongan created Albany as a strip of land 16 miles long. Over the years Albany would lose much of the land to the annex land to the north and south. At this point, Albany had a population of about 500 people. In 1754, representatives of seven British North American colonies met in the Stadt Huys, Albany's city hall, for the Albany Congress. Although it was never adopted by Parliament, it was an important precursor to the United States Constitution; the same year, the fourth in a series of wars dating back to 1689, began.
AM broadcasting is a radio broadcasting technology, which employs amplitude modulation transmissions. It was the first method developed for making audio radio transmissions, is still used worldwide for medium wave transmissions, but on the longwave and shortwave radio bands; the earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the "Golden Age of Radio", until television broadcasting became widespread in the 1950s and received most of the programming carried by radio. Subsequently, AM radio's audiences have greatly shrunk due to competition from FM radio, Digital Audio Broadcasting, satellite radio, HD radio and Internet streaming. AM transmissions are much more susceptible than FM or digital signals are to interference, have lower audio fidelity.
Thus, AM broadcasters tend to specialise in spoken-word formats, such as talk radio, all news and sports, leaving the broadcasting of music to FM and digital stations. The idea of broadcasting — the unrestricted transmission of signals to a widespread audience — dates back to the founding period of radio development though the earliest radio transmissions known as "Hertzian radiation" and "wireless telegraphy", used spark-gap transmitters that could only transmit the dots-and-dashes of Morse code. In October 1898 a London publication, The Electrician, noted that "there are rare cases where, as Dr. Lodge once expressed it, it might be advantageous to'shout' the message, spreading it broadcast to receivers in all directions". However, it was recognized that this would involve significant financial issues, as that same year The Electrician commented "did not Prof. Lodge forget that no one wants to pay for shouting to the world on a system by which it would be impossible to prevent non-subscribers from benefiting gratuitously?"On January 1, 1902, Nathan Stubblefield gave a short-range "wireless telephone" demonstration, that included broadcasting speech and music to seven locations throughout Murray, Kentucky.
However, this was transmitted using induction rather than radio signals, although Stubblefield predicted that his system would be perfected so that "it will be possible to communicate with hundreds of homes at the same time", "a single message can be sent from a central station to all parts of the United States", he was unable to overcome the inherent distance limitations of this technology. The earliest public radiotelegraph broadcasts were provided as government services, beginning with daily time signals inaugurated on January 1, 1905, by a number of U. S. Navy stations. In Europe, signals transmitted from a station located on the Eiffel tower were received throughout much of Europe. In both the United States and France this led to a small market of receiver lines designed geared for jewelers who needed accurate time to set their clocks, including the Ondophone in France, the De Forest RS-100 Jewelers Time Receiver in the United States The ability to pick up time signal broadcasts, in addition to Morse code weather reports and news summaries attracted the interest of amateur radio enthusiasts.
It was recognized that, much like the telegraph had preceded the invention of the telephone, the ability to make audio radio transmissions would be a significant technical advance. Despite this knowledge, it still took two decades to perfect the technology needed to make quality audio transmissions. In addition, the telephone had been used for distributing entertainment, outside of a few "telephone newspaper" systems, most of which were established in Europe. With this in mind, most early radiotelephone development envisioned that the device would be more profitably developed as a "wireless telephone" for personal communication, or for providing links where regular telephone lines could not be run, rather than for the uncertain finances of broadcasting; the person credited as the primary early developer of AM technology is Canadian-born inventor Reginald Fessenden. The original spark-gap radio transmitters were impractical for transmitting audio, since they produced discontinuous pulses known as "damped waves".
Fessenden realized that what was needed was a new type of radio transmitter that produced steady "undamped" signals, which could be "modulated" to reflect the sounds being transmitted. Fessenden's basic approach was disclosed in U. S. Patent 706,737, which he applied for on May 29, 1901, was issued the next year, it called for the use of a high-speed alternator that generated "pure sine waves" and produced "a continuous train of radiant waves of uniform strength", or, in modern terminology, a continuous-wave transmitter. Fessenden began his research on audio transmissions while doing developmental work for the United States Weather Service on Cobb Island, Maryland; because he did not yet have a continuous-wave transmitter he worked with an experimental "high-frequency spark" transmitter, taking advantage of the fact that the higher the spark rate, the closer a spark-gap transmission comes to producing continuous waves. He reported that, in the fall of 1900, he transmitted speech over a distance of about 1.6 kilometers, which appears to have been the first successful audio transmission using radio signals.
However, at this time the sound was far too distorted to be commercially practical. For a time he continued working with more sophist
Alternative rock is a style of rock music that emerged from the independent music underground of the 1980s and became popular in the 1990s. In this instance, the word "alternative" refers to the genre's distinction from mainstream rock music; the term's original meaning was broader, referring to a generation of musicians unified by their collective debt to either the musical style or the independent, DIY ethos of punk rock, which in the late 1970s laid the groundwork for alternative music. At times, "alternative" has been used as a catch-all description for music from underground rock artists that receives mainstream recognition, or for any music, whether rock or not, seen to be descended from punk rock. Alternative rock broadly consists of music that differs in terms of its sound, social context and regional roots. By the end of the 1980s, magazines and zines, college radio airplay, word of mouth had increased the prominence and highlighted the diversity of alternative rock, helping to define a number of distinct styles such as noise pop, indie rock and shoegaze.
Most of these subgenres had achieved minor mainstream notice and a few bands representing them, such as Hüsker Dü and R. E. M. had signed to major labels. But most alternative bands' commercial success was limited in comparison to other genres of rock and pop music at the time, most acts remained signed to independent labels and received little attention from mainstream radio, television, or newspapers. 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. In the past, popular music tastes were dictated by music executives within large entertainment corporations. Record companies signed contracts with those entertainers who were thought to become the most popular, therefore who could generate the most sales; these bands were able to record their songs in expensive studios, their works sold through record store chains that were owned by the entertainment corporations.
The record companies worked with radio and television companies to get the most exposure for their artists. The people making the decisions were business people dealing with music as a product, those bands who were not making the expected sales figures were excluded from this system. 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. 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 college radio circuit and the tastes of college students. 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 to describe independently distributed records. By 1985, indie' had come to mean a particular genre, or group of subgenres, rather than distribution status; the use of the term alternative to describe rock music originated around the mid-1980s. Individuals who worked as DJs and promoters during the 1980s claim the term originates from American FM radio of the 1970s, which served as a progressive alternative to top 40 radio formats by featuring longer songs and giving DJs more freedom in song selection. According to one former DJ and promoter, "Somehow this term'alternative' got rediscovered and heisted by college radio people during the 80s who applied it to new post-punk, indie, or underground-whatever music". 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".
Usage of the term would broaden to include new wave, punk rock, post-punk, "college"/"indie" rock, all found on the American "commercial alternative" radio stations of the time such as Los Angeles' KROQ-FM. Journalist Jim Gerr wrote that Alternative encompassed variants such as "rap, trash and industrial". In December 1991, Spin magazine noted: "this year, for the first time, it became resoundingly clear that what has been considered alternative rock – a college-centered marketing group with lucrative, if limited, potential- has in fact moved into the mainstream"; the bill of the first Lollapalooza, an itinerant festival in North America conceived by Jane's Addiction frontman Perry Farrell, reunited "disparate elements of the alternative rock community" including Henry Rollins, Butthole Surfers, Ice-T, Nine Inch Nails and the Banshees and Jane's Addiction. That same year, Farrell coined the term Alternative Nation. In the late 1990s, the definition again became more specific. In 1997, Neil Strauss of The New York Times defined alternative rock as "hard-edged rock distinguished by brittle,'70s-inspired guitar riffing and singers agonizing over their problems until they take on epic proportions".
Defining music as alt