Decoder

A noise enthusiast discovers that by changing the background music from pleasantly calming to industrial "noise" music, he can incite riots and a revolution against the looming power of the government.

Decoder is a 1984 mystery horror movie directed by Muscha, starring Britzhold Baron De Belle, Christiane Felscherinow, FM Einheit. It holds an IMDb rating of 6.3/10 from 1,286 votes and runs 1h 27m.