What you want is Starchildren: Velvet Generation, a game set in a fascist-dominated future where the Ministries of Culture dictate what kinds of art and music are allowed, and the PCs are underground musicians sparking revolution with their music. As you might guess, it's heavily influenced by Bowie, Rush, and Pink Floyd, among others.
You description reminds me of a short tv series about a teen who ends up in a parallel fascist universe and begins to inspire rebellion among the downtrodden by becoming a rock star using the music he remembers from his Earth. The name of which escapes my google-fu currently.