Elton John, Maxine Welton (Jazz singer) Neil Diamond (at the Troubadour when I was a kid and later when he was old (and I wasn't) in a big arena,Barbra Steisand, Paul McCartney (twice in private concerts), Paul Simon, Cheryl Crow (at her cousin's Bar Mitzvah)....I'm not adding any others because I feel old.
Again...I saw these people when we were young......