I was going to say before that I've been a Cluster and Harmonia fan for ages, and that one of my problems with Tangerine Dream is that the approach and feeling, if not the music itself (well, sometimes the music too), sounds closer to ELP than to the other German bands mentioned, which is why it annoys the crap out of me when all these "Kraut"
acts are lumped together.
Of course, some people would have run as far away from Cluster and Harmonia as possible had I posted that.