John Lydon is a British singer-songwriter. He was a member of the English punk rock band Sex Pistols and worked with Sid Vicious on the album Johnny Rotten and Sid Vicious of the Sex Pistols Are Outrageous and Outspoken!. Through his work with Public Image Ltd., he led the arty post-punk movement and subsequently participated in the alternative rock scene. His most popular songs include Stump, Open Up with Leftfield, and Psychopath. Lydon has appeared in the documentary films Super Duper Alice Cooper and The Public Image is Rotten, as well as the feature film Cop Killer.