premise: Brad Wilk was a manager for Greta.
hypothesis: Brad Wilk . Wilk started his career as a drummer for Greta in 1990 , and helped co-found Rage with Tom Morello and Zack de la Rocha in August 1991 . Greta was an American hard rock band formed in 1990 by Paul Plagens , Kyle Baer , Josh Gordon , and Brad Wilk . Rage Against the Machine ( also known as RATM or simply Rage ) is an American rock band from Los Angeles , California . Formed in 1991 , the group consists of rapper and vocalist Zack de la Rocha , bassist and backing vocalist Tim Commerford , guitarist Tom Morello , and drummer Brad Wilk .