is this the greatest live band of all time?

For me bands were different in different years saw Zeppelin 5 times 73 was the best saw the stones 6 times 72 was the best from Texas so I saw Top well over 20 tomes but 76 was unreal. And anyone at the 1978 Texas Jam?
Led Zeppelin 1973
ZZ Top 1976
Stones 1972
John Mellencamp 1985
Texxas Jam 1978

What a "loaded" question!
So subjective. Best recorded live show - Allman Brothers @ Fillmore East.

At the show: Grateful Dead when touring with that insane equipment known as the Wall of Sound. Look it up, mostly McIntosh amps.
Sting at The Bottom Line w/original Dreams of the Blue Turtles band.
Steely Dan at Red Rocks

Floyd was excellent, but stuck to the script, same goes for the Stones.

Too many more to list. 

Dire Straits on the top of my book.

I LOVE the Beatles BUT they're a studio band.

The correct answer is U2.