Grotus is an industrial and experimental rock band from San Francisco, California which was active from 1989 to 1996. The group was formed by Adam Tanner and John Carson, soon to be joined by Lars fox who became the group's vocalist and later Bruce Boyd. The band featured two bassists with two drummers and made use of ethnic instruments with humorous lyrics. The group disbanded after their third album Mass failed to chart a single for their label, London Records. The group is primarily remembered as being a member of Jello Biafra's Alternative Tentacles record label, as well as being promoted by Faith No More's Mike Patton.