The School of Rock (2003)

Overly enthusiastic guitarist Dewey Finn gets thrown out of his bar band and finds himself in desperate need of work. Posing as a substitute music teacher at an elite private elementary school, he exposes his students to the hard rock gods he idolizes and emulates — much to the consternation of the uptight principal. As he gets his privileged and precocious students in touch with their inner rock 'n' roll animals, he imagines redemption at a local Battle of the Bands.