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| Jack Black | Dewey Finn |
| Joan Cusack | Rosalie Mullins |
| Mike White | Ned Schneebly |
| Sarah Silverman | Patty |
| Jordan-Claire Green | Michelle |
| Veronica Afflerbach | Eleni |
| Miranda Cosgrove | Summer |
| Robert Tsai | Lawrence |
| Angelo Massagli | Frankie |
| Kevin Clark | Freddy |
| Maryam Hassan | Tomika |
| Caitlin Hale | Marta |
| Cole Hawkins | Leonard |
| Brian Falduto | Billy |
| James Hosey | Marco |
| Aleisha Allen | Alicia |
| Zachary Infante | Gordon |
| Joey Gaydos Jr. | Zack |
| Rebecca Brown | Katie |
Fired from his group and desperate for money, a guitarist poses as a teacher for students who play in a school band.
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