The Beastie Boys were an American hip hop and rap rock group formed in New York City in 1979. They were composed of Adam "Ad-Rock" Horovitz (vocals, guitar), Adam "MCA" Yauch (vocals, bass), and Michael "Mike D" Diamond (vocals, drums). The Beastie Boys were formed out of members of experimental hardcore punk band the Young Aborigines, which was formed in 1979, with Diamond on drums, Jeremy Shatan on bass guitar, John Berry on guitar, and Kate Schellenbach later joining on percussion. When Shatan left New York City in mid-1981, Yauch replaced him on bass and the resulting band was named the Beastie Boys. Berry left shortly thereafter and was replaced by Horovitz.