I've seen alot of different groups in my life.Its a tricky question. Allman brothers were great ,Tom Petty ,Springsteen I saw right after 9/11 and other times ,the guy plays and plays.Paul McCartney for a guy his age he played 21/2 hours at Citifield and never took a drink of water and it was Hot out.Santana Great .Neil Diamond played on and on and on ....They come to mind.Stones were good .But the Dead were good when Jerry wasn't so stoned but that was Jerry.