Glam metal in the context of "Glam rock"

Hard rock or heavy rock is a heavier subgenre of rock music typified by aggressive vocals and distorted electric guitars. Hard rock began in the mid-1960s with the garage, psychedelic and blues rock movements. Some of the earliest hard rock music was produced by the Kinks, the Who, the Beatles, the Rolling Stones, Cream, Vanilla Fudge, and the Jimi Hendrix Experience. In the late 1960s, bands such as Blue Cheer, the Jeff Beck Group, Iron Butterfly, Led Zeppelin, Creedence Clearwater Revival, Golden Earring, Steppenwolf, Grand Funk Railroad, Free, and Deep Purple also produced hard rock.

The genre developed into a major form of popular music in the 1970s, with the Who, Led Zeppelin and Deep Purple being joined by Black Sabbath, Alice Cooper, Aerosmith, Kiss, Queen, AC/DC, Thin Lizzy and Van Halen. During the 1980s, some hard rock bands moved away from their hard rock roots and more towards pop rock. Established bands made a comeback in the mid-1980s and hard rock reached a commercial peak in the 1980s with glam metal bands such as Mötley Crüe, Bon Jovi and Def Leppard as well as the rawer sounds of Guns N' Roses which followed with great success in the later part of that decade.

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.

Aerosmith is an American rock band formed in Boston in 1970. The group consists of lead vocalist Steven Tyler, bassist Tom Hamilton, drummer Joey Kramer, and guitarists Joe Perry and Brad Whitford. Their style, which is rooted in blues-based hard rock, has also incorporated elements of pop rock, heavy metal, glam metal, and rhythm and blues, and has inspired many subsequent rock artists. Aerosmith is sometimes referred to as "the Bad Boys from Boston" and "America's Greatest Rock and Roll Band". The primary songwriting team of Tyler and Perry is sometimes referred to as the "Toxic Twins".

Perry and Hamilton were originally in a band together, the Jam Band, where they met up with Tyler, Kramer, guitarist Ray Tabano, and formed Aerosmith; in 1971, Tabano was replaced by Whitford. They released a string of multi-platinum albums starting with their eponymous debut in 1973, followed a year later by Get Your Wings. The band broke into the mainstream with their next two albums, Toys in the Attic (1975) and Rocks (1976). Draw the Line and Night in the Ruts followed in 1977 and 1979, respectively. Throughout the 1970s, the band toured extensively and charted a dozen Hot 100 singles, including their first Top 40 hit "Sweet Emotion" and the Top 10 hits "Dream On" and "Walk This Way". By the end of the decade, they were among the most popular hard rock bands in the world and developed a following of fans, often referred to as the "Blue Army". Drug addiction and internal conflict led to the departures of Perry and Whitford in 1979 and 1981, respectively. The band did not fare well and the album Rock in a Hard Place (1982) failed to match previous successes.

Judas Priest are an English heavy metal band formed in Birmingham in 1969. They have sold over 50 million albums and are frequently ranked as one of the greatest metal bands of all time. They have been referred to as one of the pioneers of the new wave of British heavy metal (NWOBHM) movement, and cited as a formative influence on various metal subgenres, including speed metal, thrash metal, and power metal, as well as the hard rock and glam metal scene of the 1980s. Despite an innovative and pioneering body of work in the latter half of the 1970s, the band had struggled with poor record production and a lack of major commercial success until 1980, when their sixth studio album British Steel brought them notable mainstream attention.

During the 1970s, the core of bassist Ian Hill, lead singer Rob Halford and guitarists Glenn Tipton and K. K. Downing saw a revolving cast of drummers (with Les Binks being the only one who played on more than one album), before Dave Holland joined them for ten years beginning in 1979. Since Holland's departure, Scott Travis has been the band's drummer. Halford left Judas Priest in 1992, and after a four-year hiatus, they regrouped in 1996 with Tim "Ripper" Owens (formerly of Winter's Bane) replacing him. After two albums with Owens, Halford returned to the band in 2003. Downing left Judas Priest in 2011, replaced by Richie Faulkner. The current line-up consists of Hill, Tipton, Travis, Halford and Faulkner; although Tipton remains as an official member of the band, he has limited his touring activities since 2018 due to Parkinson's disease, with Andy Sneap filling in for him. Hill and Tipton are the only two members of the band to appear on every album.

Thrash metal (or simply thrash) is an extreme subgenre of heavy metal music characterized by its overall aggression and fast tempo. The songs usually use fast percussive beats and low-register guitar riffs, overlaid with shredding-style lead guitar work.

The genre emerged in the early 1980s as musicians began fusing the double bass drumming and complex guitar stylings of the new wave of British heavy metal (NWOBHM) with the speed and aggression of hardcore punk and speed metal and the technicality of progressive rock. Philosophically, thrash metal developed as a backlash against both the conservatism of the Reagan era and the much more moderate, pop-influenced, and widely accessible heavy metal subgenre of glam metal which also developed concurrently in the 1980s. Derived genres include crossover thrash, a fusion of thrash metal and hardcore punk.

Popular music in the 1990s saw the continuation of teen pop and dance-pop trends which had emerged in the 1970s and 1980s. Furthermore, hip hop grew and continued to be highly successful in the decade, with the continuation of the genre's golden age. Aside from rap, reggae, contemporary R&B, and urban music in general remained popular throughout the decade; urban music in the late-1980s and 1990s often blended with styles such as soul, funk, and jazz, resulting in fusion genres such as new jack swing, neo-soul, hip hop soul, and g-funk which were popular.

Similarly to the 1980s, rock music was also very popular in the 1990s, yet, unlike the new wave and glam metal-dominated scene of the time, grunge, Britpop, industrial rock, and other alternative rock music emerged and took over as the most popular of the decade, as well as punk rock, ska punk, and nu metal, amongst others, which attained a high level of success at various points throughout the years.