Watch: MACHINE HEAD's ROBB FLYNN Joins VIO-LENCE On Stage In San Francisco

MACHINE HEAD frontman Robb Flynn joined his former band VIO-LENCE on stage last night (Saturday, December 14) at The Great American Music Hall in San Francisco, California to perform the songs "Kill On Command" and "World In A World". Video of his appearance can be seen below. VIO-LENCE played at Th...