My most played live album is Uriah Heep Live '73 and I got to see them in July '74. They were like Deep Purple and Yes mixed together, a bit more mystical than Purple, Ken Hensley fantastic Hammond player and vocalist David Byron was on par with Ian Gillan. Now they're all dead except guitarist Mick Box, who actually still plays with the band.
My next most played live album is Peter Gabriel Plays Live. I liked him and Genesis when I first saw them perform Watcher of the Skies on Midnight Special around '74, but when he went solo and started this African stuff in the early 80s, it just really caught my ear.
My next two most played live albums were
Grand Funk Railroad Live and Deep Purple Made in Japan. Since the covers have already been posted I'll leave them off. The first five Grand Funk albums I played more than anything else from '69 to '72, then I discovered Deep Purple in '72 and saw them that year and then I discovered Uriah Heep when Demons & Wizards came out.