My List to kick things off.
Deep Purple.
Spirit
Uriah Heep
The Tubes
Moving to the 80's
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Tears for Fears
Ah Ha
Saying most of those bands were underrated is like saying Little Feat was overrated while Lowell George was still alive.
BTW,I saw Uriah Heep live in concert 7 times,and those were 7 of the best concerts I ever saw. They, the original Marshall Tucker Band, and Lynard Skynard were about as good as it gets.