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Dewey Finn,a hard rocksinger and guitarist,is unanimously kicked out of his band No Vacancy by his bandmates for his arrogance and frequent hyperactive stage antics. Dewey receives a phone call intended for Ned from Rosalie Mullins,principal of Horace Green,a prestigious prep school,asking Ned to fill in for a teacher who would be out for several weeks.
Dewey has no real idea how to carry out his role as a teacher and instead simply gives his students constant free time.However,when he overhears his pupils playing in music class he realizes that the children of his class are musically talented.He decides to turn his temporary job into what he tells them is a special class project,but is actually a personal one:to turn a classroom full of kids into a rock band and crew.
After realizing that most of the kids are interested primarily in pop and contemporary music,Dewey turns the school days into lessons of rock history and music playing.
Meanwhile,the class audition for the Battle of the Bands,which Dewey told them was their "school project".With Summer's help,Dewey persuades the Battle's managers by lying that the students are all terminally ill with "stick-it-to-da-man-ni-osis", a fictional rare blood disease,and out of compassion,they allow the students to perform in the Battle of the Bands.
However,Dewey is exposed when Ned receives a paycheck from Horace Green in the mail,knowing he has never worked there.Dewey succeeds in convincing them that he is a competent teacher,but Ned appears and confronts Dewey.His real identity is revealed,and he is fired from the school.Considering himself a failure,he falls into depression.
At the end,Summer is seen arguing a deal over her cell phoneas she enters the "School of Rock",a newly opened after-school program where Dewey continues to coach the band and Ned teaches the younger ones,and the credits roll as the band sings "The movie is over,but we're still on screen" breaking the fourth wall.