Chicago I'm a Man is pretty good too.
http://youtube/IvmeEyVd5w8?t=1m2s
Back to Iron Butterfly. In the 60's FM radio in Stereo was just getting started, and there was a Station in Pasadena CA that had real DJ''s that 'presented you' the music, not from a playlist but from their research of it and what they thought was good and interesting. I awoke one morning early to 'the Iron Butterfly theme' and it sounded soooo good ! I was hooked. Listening to that station was like going to school for good music. Anybody remember that?