Zack wrote most of Rage Against the Machine's songs, with lyrics that talked about politics and current events. The band signed with Epic Records in 1992 and released three original albums between 1992 and 1999- "Rage Against the Machine" in 1992, "Evil Empire" in 1996, and "The Battle of Los Angeles" in 1999. Zack left the band in October, 2000 for "political and creative differences". A fourth album, "Renegades", was released in December.