Rage Against the Machine is an American rock band formed in Los Angeles, California in 1991. The band's continual members are vocalist Zack de la Rocha, guitarist Tom Morello, bassist Tim Commerford and drummer Brad Wilk. Rage Against the Machine is noted for its blend of hip hop, heavy metal, punk and funk as well as its revolutionary politics and lyrics. Rage Against the Machine drew inspiration from early metal instrumentation, as well as rap acts such as Public Enemy and Afrika Bambaataa. The group's music is based primarily on de la Rocha's rhyming styles and powerful stage energy, and Morello's unorthodox guitar techniques.