Argott's film charts Green and his students as they prepare for upcoming tribute shows to Black Sabbath and Frank Zappa, the latter of whom is being commemorated at the Zappanale festival in Germany. Yet the tension that arises from these rehearsals is only the documentary's superficial focus; the real spotlight is on the teaching techniques of Green, an out-of-control, narcissistic virtuoso who secretly admits to practicing guitar in his spare time lest his students surpass him in skill, as well as employing "good cop, bad cop" stunts to motivate and inspire his headbanging charges. Extremely uninhibited in front of the camera, Green - a slightly pudgy thirty-something with a slowly receding hairline and a predilection for t-shirts and jean shorts - is a warm, friendly, and funny presence who loves to regale his student body with stories about his personal life and his music heroes, though his kindness is complemented by frequently nasty exhortations to practice more, stop listening to lame music (a problem for Madi Diaz, who arrives at the school with dreams of becoming the next Sheryl Crow) and quit acting like childish brats. At once charmingly funny (describing one student as having "that Chris Robinson, future heroin user look about her") and despicably mean ("I will kill your family," he tells a few unruly troublemakers), he's as polarizing a figure as has been seen in recent cinema.
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There's already an Oscars buzz surrounding this movie.