Um Som Diferente was released in the year 1990。Um Som Diferente is also called as Pump Up the Volume, Y a-t-il une vie après le lycée?, Wiecej czadu, Volume no Máximo, Rebelión en las ondas, Plein volume, Hart auf Sendung, Alza il volume, Adj rá kakaót!。

Mark is an intelligent but shy teenager who has just moved to Arizona from the East Coast. His parents give him a short-wave radio so he can talk to his pals, but instead he sets up shop as pirate deejay Hard Harry, who becomes a hero to his peers while inspiring the wrath of the local high school principal. When one of Harry's listeners commits suicide and Harry- inspired chaos breaks out at the school, the authorities are called in to put a stop to Harry's broadcasts.

Um Som Diferente actors and actresses include Ahmet Zappa, Christian Slater, Gregg Daniel, Holly Sampson, Mimi Kennedy, Samantha Mathis, Seth Green。