is this the greatest live band of all time?

Talking Heads
Ween
Jon Spencer Blues Explosion
Too young to have seen the 60's bands.

+1 Ween - they are actually great musicians and you really get to appreciate that when you see them live.

I have seen very few live rock concerts, but in my youth I was dragged by my friends to see a band I had never heard of, King Crimson. That was a concert! (1970, original line-up for COTCK). Soon after that I saw Jethro Tull, and that was a close second. Saw Chuck Berry about 12 years ago at a local outdoor festival - lots of energy but oddly enough I don't remember much about the music. Wanted to see the original Who, but it never happened, but my hearing thanks me.

I forgot to add the Talking Heads Stop Making Sense tour in the 80's. They was a blast too. And then for something extemely different, I saw Richard Thompson in the late 90's. Brilliant guitar playing.

Keeping this "short"
Fleetwood Mac 75:  first tour with Stevie.
Return to Forever:  Stanley Clarke, Lenny White, Al Dimeleola, Chick Corea.  PInned in my seat by these all stars.  Perfect sound in 3000 seat venue
Police 79:  Bass that hurt you
Yes:  In the Round
Roger Waters:  Wall
Tool:  Lateralus.  Best Sound EVER.  I sat behind the mixing boards.