The Pink Floyd comparison has been made before I think, but I must admit to listening to "Echoes" from their Meddle album and now see exactly where parts of Rubycon were influenced from. In fact Echoes was one of those formative tracks that got me into "EM" in the first place...
If anyone reading this wants to hear Moog-related wizardry of the highest order and finds "Swiched On Bach" just too cheesy (shame if you do), then try to hear some "Tonto's Expanding Headband." two wonderful 70's albums of greatness from one of the biggest analogue synths made at that time - an awesome machine when wielded properly - it's still running too I understand, in all its cabinets
http://www.tontostudio.com/
http://www.tontosexpandingheadband.com/
P.S. Riversong is a masterpiece and I don't think a vocoder was used either...
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me