Peter Lawrence Buck (born December 6, 1956) is an American musician and songwriter. He was a co-founder and the lead guitarist of the alternative rock band R.E.M.; he played the banjo and mandolin on several R.E.M. songs. Throughout his career with R.E.M. (1980–2011), as well as during his subsequent solo career, Buck has been at various times a member of numerous side project groups. These groups included Arthur Buck (with Joseph Arthur), Hindu Love Gods, The Minus 5, Tuatara, The Baseball Project, Robyn Hitchcock and the Venus 3, Tired Pony, The No-Ones, and Filthy Friends, each of which have released at least one full-length studio album. Additionally, the experimental combo Slow Music have released an official live concert CD. Another side project group called Full Time Men released an EP while Buck was a member. As well, ad hoc "supergroups" Bingo Hand Job (Billy Bragg and R.E.M.), Musical Kings (Michelle Malone, Peter Buck, John Keane) and Nigel & The Crosses (Robyn Hitchcock, Peter Buck, Glenn Tilbrook and others) have each commercially released one track.