If you had access to a time machine, what concerts would you go back to see?

2020 was the first year of my adult life that I did not attend any concerts. I'm sure that I'm not alone in this unfortunate situation. So, this got me thinking about both the concerts that I "missed" (could've gone, but something went wrong) or concerts I "wished I'd had the chance to see."

Plus, I thought this would be a good bookend to the ongoing (and excellent) thread about "the worst concert you ever saw."

Spirit, Santana and Zeppelin at the Kinetic. $5

Jellyfish and Toy Matinee any show
@artizen65  I saw him on that tour too, really amazing! I would have liked to see young Steve Winwood.
Zeppelin... fortunately I have had the opportunity to see just about every band I’ve wanted to see in my life. Zeppelin is the hold out.
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Mike and the Mechanics, Tower Theatre in Philadelphia around 1980. Not my favorite band, although I do love them, but it was one of those magical nights concertgoers rarely experience when the band and audience make an almost spiritual connection. When that happens, it's joyous and unforgettable.