Circle Jerks are an American hardcore punk band, formed in 1979 in Los Angeles, California. The group was founded by former Black Flag vocalist Keith Morris and Redd Kross guitarist Greg Hetson. To date, Circle Jerks have released six studio albums, one compilation, a live album and a live DVD. Their debut album, Group Sex (1980), is considered a landmark of the hardcore genre.

Keith "Lucky" Lehrer is a drummer from Los Angeles, California associated with several influential LA punk rock bands. He was originally trained in jazz then played in a number of LA punk rock bands, particularly the Circle Jerks, Redd Kross, Bad Religion, Darby Crash Band and LA's Wasted Youth, among others. Lehrer also appeared in three notable documentary films charting the punk rock music scene. He is the brother of LA's Wasted Youth guitarist Chett Lehrer. Lehrer also teaches drums, with notable students being future Bad Religion drummers Pete Finestone and Bobby Schayer. He was an early developer of hardcore punk drumming and he has been called the "Godfather of hardcore drumming". Lehrer was voted the best punk drummer of all-time by fanzine Flipside.