Pump Up the Volume
Mark Hunter, a lonely high school student, uses his shortwave radio to moonlight as the popular pirate DJ "Hard Harry." When his show gets blamed for a teen committing suicide, the students clash with high school faculty and the authorities.
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Pump Up the Volume (1990) is a drama, music movie running 1h 42m. Starring Christian Slater, Samantha Mathis, Annie Ross. Rated 7.1/10 on TMDB. Watch it online free on ZapFlix.