I've seen Jethro Tull (twice, 40 years apart), Elton John, Bob Dylan and the Dead, David Bowie at least twice, including once in a venue small enough that we could have been hit by his spit molecules.

The small venue was, IIRC, a gym at a private school in SF. There was another act before Bowie, and their sound system was TERRIBLE - really LOUD, tons of overload distortion, just awful. Bowie comes on, and the sound was amazing - clean, almost viscerally powerful, and LOUDER than the opening act. Lots of money buys good sound.