I’ve seen Sarah McLachlan many times. She tours regularly.
I saw them once, when they opened for 10,000 Maniacs.
Joan Sutherland recital, 1969 or 1970, Portland, Oregon, in whatever the concert hall was at that time (I know it’s only 54 years ago, but I don’t remember, it may have been called Civic Auditorium). She was accompanied by a piano, and it was breathtaking. She was at the top of her form.
Van Cliburn, if that name means anything to anyone. He was big in the piano trade at one time.
Cecilia Bartoli, three times. She was a singer of sorts.
I only got to see the Dregs a couple of years ago when they had their reunion tour with all the original members. I did see the Steve Morse Band back in the day when the first album came out and also last year. I mentioned seeing Morse’s other band, Flying Colors. They put out three fantastic albums and had brief tours with each. I am curious if I’m the only one who saw them. Because each member had so many other projects going they could only do a handful of US dates and a handful of European dates each time.
I’ll throw in one a little out of the ordinary, Victor Borge.
John Denver. Madison Coliseum.
The Captain and Tennille. Madison Coliseum.
Nov. 30, 1981, Rolling Stones Tattoo You tour @ Silverdome in Ponticac, MI
Opening acts? Iggy Pop and Santana. Bomb*ass show all around 
I saw him in 2004. Amazing concert.
Off the top of my head, mine are :
Marisa Monte
William Sheller
No, it was Gainesville, FL, circa 2007. I don’t remember the name of the opening act, but they saved the day by accompanying the Girls on several songs.
Bet nobody here has seen these:
In the spring of 2016 I was at a Bruce Springsteen concert in Dublin and Bono came on the stage and they did the Patti Smith song “Because the Night”.
Back in the mid-70’s I was at some variety-type show that had several different acts. I don’t remember why the hell I was there as it wasn’t the kind of show that would otherwise interest me in the least. The only artist I remember knowing who it was at the time was Lou Rawls.
Lemmy was in Hawkwind when I saw them.
I saw Bob Dylan and the Band (including Robbie Robertson) at Chicago Stadium in early 1974. It was Dylan’s first tour since his motorcycle accident in 1966.
I saw John Fogerty get onstage with Duke Tumatoe at a small blues club in Mishawaka IN and do old CCR tunes. This was near the end of his self-imposed ban on performing the old tunes. He didn’t like paying royalties to sing his own songs.
I saw Stevie Ray Vaughan at his last show as a headliner, two days before he went to Alpine Valley to open for Eric Clapton. This was at the Kalamazoo County Fair.
Small nitpick: “Because The Night” is also a Springsteen song. The history of the song is a bit complicated: when Patti recorded her album “Easter”, Bruce and the E Street Band were working on “Darkness On The Edge Of Town” in an adjacent studio in the same building. Patti visited their session, and Bruce played her an unfinished song he was working on and was struggling with. Patti took it, completed it and recorded it for her own album, and it became a hit. Bruce never released an own studio version, but he played it in concert. I first heard his version on the 5 LP box “Live 1975-1985”.
Nope. Saw them with Mojo Nixon. They did an extended Christmas rendition of Bitchin’ Camaro. We square danced in the pit. There was an inflatable sheep.
Same here, including at Lilith Fair at least twice.
Which is why I more consider it a Smith song than a Springsteen song.
Fair enough.
The Chambers Brothers
Elephant’s Memory
The Hello People
The Tubes
The Runaways
Roxy Music
Carmen
Dave Mason
I remember Van Cliburn, though I never saw him in concert. I did see him on The Steve Allen Show, though.
I “discovered” Al Di Meola and Paco De Lucia in about 1979, when I first heard their Elegant Gypsy album. It was mesmerizing. It was a great pleasure to see them both (separately) in concert many years later. True masters of the guitar.