Peter Lawrence Buck is an American musician and songwriter. He was a co-founder and the lead guitarist of the alternative rock band R.E.M. He also plays 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 also been at various times an official member of numerous 'side project' groups. These groups included Arthur Buck, 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, Musical Kings and Nigel & The Crosses have each commercially released one track.

R.E.M. was an American alternative rock band from Athens, Georgia, formed in 1980 by drummer Bill Berry, guitarist Peter Buck, bassist Mike Mills, and lead vocalist Michael Stipe, who were students at the University of Georgia. One of the first alternative rock bands, R.E.M. was noted for Buck's ringing, arpeggiated guitar style; Stipe's distinctive vocal quality, unique stage presence, and obscure lyrics; Mills's melodic bass lines and backing vocals; and Berry's tight, economical drumming style. In the early 1990s, other alternative rock acts such as Nirvana and Pavement viewed R.E.M. as a pioneer of the genre. After Berry left the band in 1997, the band continued its career in the 2000s with mixed critical and commercial success. The band broke up amicably in 2011 with members devoting time to solo projects after having sold more than 90 million albums worldwide and becoming one of the world's best-selling music acts.