If Stone Temple Pilots ever does that acoustic tour focusing on their softer songs they cancelled due to COVID (they've toured since but not that particular idea.) Perdida is one of my favorite "post-prime" albums from any band, and in general STP's softer material is what makes them one of my favorites.
I'll go to see My Chemical Romance if they put out a new album.
David Gilmour.
Weezer in a theater (I went to the Hella Mega Tour but Weezer I've heard is way better in a theater than an arena.)
Most of the musicians I listen to are indie Japanese alt/rock/shoegaze bands so there's a slim chance I'll get to listen to them live unless I actually start living in Japan for a little while...which is certainly what I plan to do in a decade or so if there's nothing (or more specifically, nobody) to tie me down elsewhere.
Idles, Ghost, Wind Rose, and Parquet Courts. For musicians who are no longer around, definitely John Coltrane and Audioslave/Soundgarden. They all seem like they put on a hell of a show and the people who listen to them seem to not be assholes for the most part.
None at all? Dude! Move somewhere else, or start a bar band and be the live music!
I am older and love live music so have seen some incredible bands, I don't do stadium/arena shows anymore, they used to be general admission shows, just run out onto the floor!
If I could see any artist AGAIN it is Fela Kuti, hands down.
Someone I didn't see but would have liked to? My concert regret is Kinky, they came here to a club and my kid loved them, I thought it was not an all ages show and didn't want to go without her - turned out it was an all ages show, but was sold out when I figured it out.
I really have seen so many amazing concerts, so many bands that later got famous too, it's hard to be upset at what I missed.
I've done my share of live concerts when I was younger. Saw Depeche Mode, The Rolling Stones, U2, Duran Duran, my wife dragged me to see NSYNC (never again), and we took our kid to see The Wiggles. These days I have no urge to see any band live. Part of it is me getting older (get off my lawn!) but mainly it's because the cost of concerts skyrocketed 'cause of TicketScamster.
If I could go back in time, I'd definitely want to see The Beatles. Also I'd love to have been in Helsinki in 2005 at the Nightwish's "End of an Era" concert.