Can't pick one. I can't remember half of them for Pete's sake. I don't think I ever saw one show straight at least until I was 30 anyway and I don't regret it one bit. Here are 5 shows that stick in my mind

Any of the 4 times I saw Tull, always top notch
Dixie Dregs, front table at the Paradise, twice
Larry Carlton, front table at the Paradise
Atlanta Rhythm Section , Orpheum
Rush , Music Hall
way too many more I have left off. I can say I have pretty much never seen a bad concert, at least that I can remember.