Changes

'''Rock music''' is a form of [[popular music]] with a prominent  vocal melody accompanied by [[guitar]], [[drums]], and [[Bass guitar|bass]]. Many styles of rock music also use keyboard instruments such as [[organ (music)|organ]], [[piano]], [[mellotron]], and [[synthesizers]]. Other instruments sometimes utilized in rock include [[harmonica]], [[violin]], [[flute]], [[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''' is a form of [[popular music]] with a prominent  vocal melody accompanied by [[guitar]], [[drums]], and [[Bass guitar|bass]]. Many styles of rock music also use keyboard instruments such as [[organ (music)|organ]], [[piano]], [[mellotron]], and [[synthesizers]]. Other instruments sometimes utilized in rock include [[harmonica]], [[violin]], [[flute]], [[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 the [[All Music Guide]], "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."<ref>[http://www.allmusic.com/cg/amg.dll?p=amg&sql=77:32 allmusic - Rock and Roll]</ref>

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 the [[All Music Guide]], "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." [http://www.allmusic.com/cg/amg.dll?p=amg&sql=77:32 allmusic - Rock and Roll]

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 fusion|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 music|heavy metal]], [[hard rock]], [[progressive rock]], and [[punk rock]]. Rock subgenres that emerged in the 1980s included [[synth-rock]], [[hardcore punk]] and [[alternative rock]]. In the 1990s, rock subgenres included [[Grunge music|grunge]], [[Britpop]], [[indie rock]], and [[nu metal]].

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 fusion|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 music|heavy metal]], [[hard rock]], [[progressive rock]], and [[punk rock]]. Rock subgenres that emerged in the 1980s included [[synth-rock]], [[hardcore punk]] and [[alternative rock]]. In the 1990s, rock subgenres included [[Grunge music|grunge]], [[Britpop]], [[indie rock]], and [[nu metal]].