I know there's lots more, not at least some great blues and jazz acts which have escaped my mind now, but also more rock bands as well. I would have to figure about this a year or so, lol. But these are the ones I remember atm, in random order since the 80s:
Motörhead (RIP Lemmy, Clarke, Taylor)
DAD
Allan Holdsworth (three times) (RIP)
Page & Plant (with Black Crowes as warm up act, and an Egyptian orchestra as back up)
John Scofield (three times)
Nocturnal Rites
Udo (doing a tour of only classic Accept songs)
Van Morrison
Red Hot Chili Peppers (with a then unknown Moby as warm up act. Moby did a cool thing, starting a song saying: "This is written by a dead guy from Seattle!" Everyone expected a Nirvana song back then (around -93), but instead he played Foxy Lady by Jimi Hendrix.. Brilliant! (He actually also should've put "left hand guitarist" to the introduction). And of course Flea played totally nekkid the whole show..)
Katrina and the Waves
Laibach
Wayne Shorter
Anthrax
John McLaughlin
Neil Young (with Pearl Jam as backing band)
Eric Clapton
Candlemass
Danko Jones
Peter Green (after his come back in the 90s)
Jack DeJohnette
Rush (twice, one of my favourite bands ever, but they toured extremly rarely close to my sorroundings)
Tommy Emmanuel
Meshuggah (countless times since the 80s)
Deep Purple (with Mk II setting in mid 90s, I believe Blackmore left later during that tour. Which IIRC was his second time doing that during his Purple years lol.)
Ross The Boss (ex Manowar guitarist). Both on stage at House of Metal festival in my hometown, but also in the studio rehearsal room (drums, amps, PA etc) at my brother's house the day after. A quite small room totally over-crammed with people all singing along to "Battle Hymns". That was bloody awesome, and a great memory for everyone who was there.
Also tons of artists/bands mostly known in my country or locally during the decades.
Would love to see David Gilmour, Roger Waters and Paul McCartney, since these legends still seem to deliver live. Maybe also Iron Maiden, but only if their set list consist of stuff up till around mid 80s (they did a Powerslave anniversary tour, I highly regret missing out on that one).