Beastie Boys were an American hip hop group from New York City, formed in 1981. The group was composed of Michael "Mike D" Diamond, Adam "MCA" Yauch, and Adam "Ad-Rock" Horovitz. 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 the summer of 1981, Yauch replaced him on bass and the resulting band was named Beastie Boys. Berry left shortly thereafter and was replaced by Horovitz.