Funny thing is that even before I opened your thread, I was thinking 3 Dog Night. I think I can also add a few others.
1- Mountain
2- J Geils Band
3- Sly and The Family Stone
4- Vanilla Fudge
5- Cactus
6- Quicksilver Messenger Service Note.. They were the first band I saw at Woodstock
Here are 2 more bands from the early 70's Sir Lord Baltimore was really one of the first heavy metal bands. Although I like blues/jazz, I did love there rock style.. Hard Driving
I always liked Three Dog Night! They sometimes play the Gulfstream Race Track, in Hallendale, well, they did last year, I think!
This was the one I liked the most. The sound is a little low, but ya'll will remember.