One of the best in the field hasn’t been mentioned. Nor are they in The R&R Hall of fame despite their selling out Shay stadium faster than the Beatles. Led Zeppelin refused to play after they opened. That band Grand Funk Railroad
BTW, I like CTS immensely But they are not heavy but progressive and way ahead of their time.
I also saw Iron Butterfly do the entire Metamorphosis album at a nightclub in Ocean City MD back in the mid 70’s. It cost $3 a head. Probably the best $3 I’ve spent. Well worth seeing/hearing