The grandson of a banjo player and the son of a vocalist, Pegg taught himself to play the guitar. Although he worked in an insurance office for a year, he was increasingly drawn to a career in music. After playing lead guitar in Roy Everett's Blueshounds, he switched to the bass and joined a pop band, the Uglys.
A growing interest in folk music climaxed with Pegg joining Ian Campbell's Folk Group as an acoustic bass and mandolin player. One of England's best folk bands of the early-1960s, Ian's Campbell's Folk Group provided Pegg with a chance to learn the skills that he brought to the more-electric Fairport Convention. Peggmoved into the rock arena when he accepted an invitation to replace a departing John Glascock as bassist for Jethro Tull. Pegg remained with the group for fifteen years. His bass playing was featured on the band's albums, Broadsworth, Under Wraps, Crest Of A Knave, Rock Island, Catfish Rising, Roots To Branches and, with Fairport band-mate Dave Mattacks on drums, A Little Light Music.
Devoting his full-time attention to Fairport Convention, in 1995,Peggwas replaced, in Jethro Tull, by Jonathan Noyce. ~ Craig Harris, Rovi