I'm a big GFR fan. Still have my pp "Live" lp. Pretty good shape considering I've played it a lot. I don't get tired of hearing their stuff.
Reaction to possibly the best live rock performance I've heard. Grand Funk
Always loved Grand Funk, especially in concert. I saw them 3 times as a youth.
I found this great reaction video from a younger guy hearing them for the first time, singing one of their best songs, Inside Looking Out.
If you're young this'll show you why us old farts are so hard on most current music.
It doesn't get much better than this.