There are multiple artists with this name. 1. Formed in the San Francisco East Bay in 1989, from the ashes of Isocracy, the Vagrants, and Crimpshrine. Filth was a hardcore band that would help define the "East Bay hardcore" style. The band combined the more upbeat, sometimes poppy guitar styles of Isocracy's Lenny Rokk with harsh screamed vocals, courtesy of Crimpshrine roadie, Jake Sayles. The rhythm section was composed of an East Bay punks as Mike-o the Psycho