Here's a fairly recent documentary about the European(German) Pop Tech group Kraftwerk. They are currently touring with their latest 3-D visual show and music(sound). My favorite Kraftwerk album is Radio-Activity which has about 15 seconds of silence in it's track 1. Geiger Counter. I'm not exactly sure if it has some meaning besides the effect. Possibly it's a spoof or reference to John Cage's 4'33".