1- Todd Rudgren 1972. Pretty much just a speaker, pre-amp, and guitar. And he played his heart out, gave 100% plus.
2- Led Zepplin 1978 Met Sports Center ( Minnesota, USA ) Hit the stage 2 hours 40 minutes late, tired worn out, some of the crappiest playing ever, and did an encore for the few people left. ( and I'd seen them at their best three years earlier 1975 at the Guthrie when they were awesome. )
3- Jim Morrison and the Doors.