Rock music is a form of popular music with a prominent vocal melody, accompanied by electric guitar, bass guitar, and drums. Many styles of rock music also use keyboard instruments such as organ, piano, mellotron, and synthesizers. Other instruments sometimes utilized in rock include saxophone, harmonica, violin, flute, French horn, banjo, melodica, and timpani. Also, less common stringed instruments such as mandolin and sitar are used. Rock music usually has a strong back beat, and often revolves around the guitar, either solid electric, hollow electric, or acoustic.
Rock music has its roots in 1940s and 1950s rock and roll and rockabilly, which evolved from blues, country music and other influences. According to Allmusic, "In its purest form, Rock & Roll has three chords, a strong, insistent back beat, and a catchy melody. Early rock & roll drew from a variety of sources, primarily blues, R&B, and country, but also gospel, traditional pop, jazz, and folk. All of these influences combined in a simple, blues-based song structure that was fast, danceable, and catchy."
In the late 1960s, rock music was blended with folk music to create folk rock, blues to create blues-rock and with jazz, to create jazz-rock fusion, and without a time signature to create psychedelic rock. In the 1970s, rock incorporated influences from soul, funk, and latin music. Also in the 1970s, rock developed a number of subgenres, such as soft rock, heavy metal, hard rock, progressive rock, and punk rock. Rock subgenres that emerged in the 1980s included synthpop, hardcore punk and alternative rock. In the 1990s, rock subgenres included grunge, Britpop, indie rock, and nu metal.
A group of musicians specializing in rock music is called a rock band or rock group. Many rock groups consist of a guitarist, lead singer, bass guitarist, and drummer, forming a quartet. Some groups omit one or more of these roles and/or utilize a lead singer who plays an instrument while singing, sometimes forming a trio or duo; others include additional musicians such as one or two rhythm guitarists and/or a keyboardist. More rarely, groups also utilize stringed instruments such as violins or cellos, and/or horns like saxophones, trumpets or trombones.
Audioslave was an American hard rock supergroup that formed in Los Angeles, California in 2001. It consisted of ex-Soundgarden frontman and rhythm guitarist Chris Cornell and the former instrumentalists of Rage Against the Machine; Tom Morello (lead guitar), Tim Commerford (bass and backing vocals) and Brad Wilk (drums). Critics initially described Audioslave as an amalgamation of Rage Against the Machine and Soundgarden, but by the band's second album, Out of Exile, noted that it had established a separate identity.
The band's trademark sound was created by blending 1970s hard rock with 1990s grunge. Moreover, Morello incorporated his well-known, unconventional guitar solos into this mix. As with Rage Against the Machine, the band prided themselves on the fact that all sounds on their albums were produced using only guitar, bass, drums and vocals; no samples were ever used.
After Audioslave released three successful albums, received three Grammy nominations, sold more than eight million records worldwide, and became the first American rock band to perform an open-air concert in Cuba, Cornell issued a statement in February 2007 that he was permanently leaving the band "due to irresolvable personality conflicts as well as musical differences". As the other three members were busy with the Rage Against the Machine reunion, and Morello and Cornell had each released solo albums in 2007, Audioslave was officially disbanded.
Mudhoney live in 2007 (l-r: Guy Maddison, Mark Arm, Dan Peters, Steve Turner).
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, The Rolling Stones
, The Who
, Black Sabbath
, Led Zeppelin
, Pink Floyd
, Lynyrd Skynyrd