Never Mind the Bollocks, Here's the Sex Pistols is the only studio album by English punk rock band the Sex Pistols, released on 28 October 1977 through Virgin Records in the UK and on 11 November 1977 through Warner Bros. Records in the US. As a result of the Sex Pistols' volatile internal relationships, the band's lineup saw changes during the recording of the album. Original bass guitarist Glen Matlock left the band early in the recording process, and while he is credited as a co-writer on all but two of the tracks, he only played bass and sang backing vocals on one track, "Anarchy in the U.K." Recording sessions continued with a new bass player, Sid Vicious, who is credited on two of the songs written by the band after he joined. While Vicious's bass playing appeared on two tracks, his lack of skill on the instrument meant that many of the tracks were recorded with guitarist Steve Jones playing bass instead. Drummer Paul Cook, Jones and singer Johnny Rotten appear on every track. The various recording sessions were led alternately by Chris Thomas or Bill Price, and sometimes both together, but as the songs on the final albums often combined mixes from different sessions, or were poorly documented who was present in the recording booth at the time, each song is jointly credited to both producers.