Some of the best early work of German Krautfathers Can came from assorted soundtrack music they did; this track, the previously-unreleased "The Million Game" (MP3) was the theme to a 1971 TV show called Das Millionenspiel. It apparently existed in segments, puzzled together Frankenstein-like for the compilation Kraut! Bloody Rageous, which has been popping up on CD over the years piecing together some of the lesser known moments of the German 60s/70's underground (many of these tracks appeared on 90's LPs in a series called Prae-Kraut Pandemonium). If you're missing the better-known Can from your collection, hop to it, Mute has been issuing great sounding remasters of their entire catalogue in the last two years with a new batch just hitting now of some of the later period discs. I bought a lot of these on CD back when Restless was issuing them in the 1980's and the sound of the new batch is a hundred times better.
Secondly, here's an excerpt from a 1971 Bremen radio concert from Kraftwerk, "Heavy Metal Kids" (MP3) is a side of the band their present-day fans don't hear much, full on guitar and drums raging along.