Geoffrey Lyall (born May 30, 1949 in Detroit, Michigan), better known as Klaus Flouride, is best known as the bassist for the San Francisco, California, punk rock band Dead Kennedys from the group's inception in June 1978 until the band's break-up in December 1986, although he also produced four solo albums during the 1980s and 1990s.
Flouride began working on a solo album following the release of Dead Kennedys' second album, 1982's Plastic Surgery Disasters, coming out with the 12" single "Shortnin' Bread" (with "The Drowning Cowboy" as the B-Side) in 1982 and the EP Cha Cha Cha With Mr. Flouride in 1985.
After the breakup, Flouride returned to his solo career, releasing Because I Say So in 1988 and The Light Is Flickering in 1991, the latter album including the song "Dancing with Shauna Grant".
Flouride also works in the studio as a producer and mixer and has done projects with the Hi-Fives, Ape, and Bad Posture. He and his former band-mates also became embroiled in a protracted lawsuit with former frontman Jello Biafra over reimbursement for band income and band material, which was settled in 2000 in the favor of East Bay Ray, Flouride, and D. H. Peligro.
In 2001, Flouride reunited with Ray and Peligro under the Dead Kennedys name, taking on Dr. Know vocalist Brandon Cruz as a replacement for Biafra. Jeff Penalty replaced Cruz in 2003.
Flouride wrote one song for the Dead Kennedys, "Dog Bite", which appears on the EP In God We Trust, Inc..
Read more about Klaus Flouride: Early Career, Equipment