Grunge in the context of "1990s"

Distortion and overdrive are forms of audio signal processing used to alter the sound of amplified electric musical instruments, usually by increasing their gain, producing a "fuzzy", "growling", or "gritty" tone. Distortion is most commonly used with the electric guitar, but may be used with other instruments, such as electric bass, electric piano, synthesizer, and Hammond organ. Guitarists playing electric blues originally obtained an overdriven sound by turning up their vacuum tube-powered guitar amplifiers to high volumes, which caused the signal to distort. Other ways to produce distortion have been developed since the 1960s, such as distortion effect pedals. The growling tone of a distorted electric guitar is a key part of many genres, including blues and many rock music genres, notably hard rock, punk rock, hardcore punk, acid rock, grunge and heavy metal music, while the use of distorted bass has been essential in a genre of hip hop music and alternative hip hop known as "SoundCloud rap".

The effects alter the instrument sound by clipping the signal (pushing it past its maximum, which shears off the peaks and troughs of the signal waves), adding sustain and harmonic and inharmonic overtones and leading to a compressed sound that is often described as "warm" and "dirty", depending on the type and intensity of distortion used. The terms distortion and overdrive are often used interchangeably; where a distinction is made, distortion is a more extreme version of the effect than overdrive. Fuzz is a particular form of extreme distortion originally created by guitarists using faulty equipment (such as a misaligned valve (tube); see below), which has been emulated since the 1960s by a number of "fuzzbox" effects pedals.

Hardcore punk (commonly abbreviated to hardcore or hXc) is a punk rock subgenre and subculture that originated in the late 1970s. It is generally faster, harder, and more aggressive than other forms of punk rock. Its roots can be traced to earlier punk scenes in San Francisco and Southern California which arose as a reaction against the still predominant hippie cultural climate of the time. It was also inspired by Washington, D.C., and New York punk rock and early proto-punk. Hardcore punk generally eschews commercialism, the established music industry and "anything similar to the characteristics of mainstream rock" and often addresses social and political topics with "confrontational, politically charged lyrics".

Hardcore sprouted underground scenes across the United States in the early 1980s, particularly in Los Angeles, San Francisco, Washington, D.C., Boston, and New York, as well as in Canada and the United Kingdom. Hardcore has spawned the straight edge movement and its associated sub-movements, hardline and youth crew. Hardcore was heavily involved in the rise of the independent record labels in the 1980s and with the DIY ethics in underground music scenes. It has also influenced various music genres that have experienced widespread commercial success, including grunge and thrash metal.

American popular music (also referred to as "American Pop") is popular music produced in the United States and is a part of American pop culture. Distinctive styles of American popular music emerged early in the 19th century, and in the 20th century the American music industry developed a series of new forms of music, using elements of blues and other genres. These popular styles included country, R&B, jazz and rock. The 1960s and 1970s saw a number of important changes in American popular music, including the development of a number of new styles, such as heavy metal, punk, soul, and hip hop.

American popular music is incredibly diverse, with styles including ragtime, blues, jazz, swing, rock, bluegrass, country, R&B, doo wop, gospel, soul, funk, pop, punk, disco, house, techno, salsa, grunge and hip hop. In addition, the American music industry is quite diverse, supporting a number of regional styles such as zydeco, klezmer and slack-key. Though these styles were not always in the sense of mainstream, they were commercially recorded and therefore are examples of popular music as opposed to folk or classical music.

Independent music (also commonly known as indie music, or simply indie) is a broad style of music characterized by creative freedom, low budgets, and a do-it-yourself approach to music creation. It originated from the liberties afforded by independent record labels. Indie music describes a number of related styles, but generally refers to guitar-oriented music that deviates from mainstream conventions. There are a number of subgenres of independent music which combine its characteristics with other genres, such as indie pop, indie rock, indie folk, and indie electronic. Additionally, in certain circles, the term indie has taken on a definition entirely based on the typical sound of independent music in the 1980s, losing its connection to production style.

The origins of independent music lie in the early distribution of private press albums from the 1960s–1970s as well as late '70s British independent record labels, from the early alternative music scene such as Rough Trade, Factory, Industrial Records and Mute, which later contributed to the development of alternative rock music. NME released the influential compilation album C86 in 1986, which helped define indie rock. American independent music first emerged in the 1980s, and was spread via college radios, which led to the term college rock. Styles that evolved out of indie music and reached wide commercial success in the 1990s include grunge (Nirvana, Pearl Jam, and the Smashing Pumpkins) and Britpop (Blur, Pulp, and Oasis). In the 21st century, due to the internet, indie music saw a global spread in popularity, as music fans were no longer dependent on physical publications to find new music.

Alternative rock (also known as alternative music, alt-rock or simply alternative) is a category of rock music that evolved from the independent music underground of the 1970s. Alternative rock acts achieved mainstream success in the 1990s with the likes of the grunge subgenre in the United States, and the Britpop and shoegaze subgenres in the United Kingdom and Ireland. During this period, many record labels were looking for "alternatives", as many corporate rock, hard rock, and glam metal acts from the 1980s were beginning to grow stale throughout the music industry. The emergence of Generation X as a cultural force in the 1990s also contributed greatly to the rise of alternative music.

"Alternative" refers to the genre's distinction from mainstream or commercial rock or pop. The term's original meaning was broader, referring to musicians influenced by the musical style or independent, DIY ethos of late-1970s punk rock. Traditionally, alternative rock varied in terms of its sound, social context, and regional roots. Throughout the 1980s, magazines and zines, college radio airplay, and word of mouth had increased the prominence and highlighted the diversity of alternative rock's distinct styles (and music scenes), such as noise pop, indie rock, grunge, and shoegaze. In September 1988, Billboard introduced "alternative" into their charting system to reflect the rise of the format across radio stations in the United States by stations like KROQ-FM in Los Angeles and WDRE-FM in New York, which were playing music from more underground, independent, and non-commercial rock artists.

Neil Percival Young (born November 12, 1945) is a Canadian and American singer-songwriter. Son of journalist, sportswriter, and novelist Scott Young, Neil embarked on a music career in Winnipeg in the 1960s. Young moved to Los Angeles, forming the folk rock group Buffalo Springfield. Since the beginning of his solo career, often backed by the band Crazy Horse, he released critically acclaimed albums such as Everybody Knows This Is Nowhere (1969), After the Gold Rush (1970), Harvest (1972), On the Beach (1974), and Rust Never Sleeps (1979). He was also a part-time member of Crosby, Stills, Nash & Young, with whom he recorded the chart-topping 1970 album Déjà Vu.

Young's deeply personal lyrics and signature high tenor singing voice define his long career. He also plays piano and harmonica on many albums, which frequently combine folk, rock, country and other musical genres. His often distorted electric guitar playing, especially with Crazy Horse, earned him the nickname "Godfather of Grunge" and led to his 1995 album Mirror Ball with Pearl Jam. More recently, he has been backed by Promise of the Real.

Nu metal (sometimes stylized as nü-metal, with a metal umlaut) is a subgenre of alternative metal that combines elements of heavy metal music with elements of other music genres such as hip hop, funk, industrial, and grunge. Nu metal rarely features guitar solos or other displays of musical technique and emphasizes rhythm with instrumentation that is heavily syncopated. Nu metal guitarists often use seven-string guitars that are down-tuned to produce a heavier sound. Vocal styles are often rhythmic and influenced by hip hop, and include singing, rapping, screaming and sometimes growling. DJs are occasionally featured to provide instrumentation such as sampling, turntable scratching and electronic background music. Nu metal is one of the key genres of the new wave of American heavy metal.

In the late 1980s and early 1990s, bands like Pantera, Helmet, and Faith No More were influential in the development of nu-metal with their groove metal and alternative metal styles. Korn is often credited as pioneering the subgenre in the mid-1990s with their self-titled debut album. Nu metal became popular in the late 1990s, with bands and artists such as Korn, Limp Bizkit, and Slipknot all releasing albums that sold millions of copies.