ZZ Top /ˈziːziːtɒp/ is an American rock band that formed in 1969 in Houston, Texas. The band is composed of bassist and lead vocalist Dusty Hill, guitarist and lead vocalist Billy Gibbons (the band's leader, main lyricist and musical arranger), and drummer Frank Beard. One of just a few major label recording groups to have held the same lineup for more than 45 years, ZZ Top has been praised by critics and fellow musicians alike for their technical mastery. Of the group, music writer Cub Koda said, "As genuine roots musicians, they have few peers; Gibbons is one of America's finest blues guitarists working in the arena rock idiom [...] while Hill and Beard provide the ultimate rhythm section support." Since the release of the band's debut album in January 1971, ZZ Top has become known for its strong blues roots and humorous lyrical motifs, relying heavily on double entendres and innuendo. ZZ Top's musical style has changed over the years, beginning with blues-inspired rock on their early albums, then incorporating new wave, punk rock, and dance-rock, with heavy use of synthesizers. The band has had global album sales in excess of 50 million as of 2014. ZZ Top was inducted into the Rock and Roll Hall of Fame in 2004. Four of their studio albums have been certified as gold records, three as platinum records, and two as multi-platinum. Their 1983 album Eliminator, remains the group's most commercially successful record, selling over 10 million units in the United States. ZZ Top also ranks 80th in U.S. album sales, with 25 million total units. The band is known for Hill and Gibbons' long beards; despite his surname, Frank Beard usually only has a moustache.