Would love to see Mastodon, Peter Gabriel and Tori Amos live - I''ll try to catch them next time they tour Europe. Also Avenged Sevenfold and Transatlantic - both of them with Mike Portnoy. I've got TransAt's Live in Europe dvd/cd set and it's quite amazing. Also would adore to see Neil Young - or even better, to have seen him with Crazy Horse in 1973 or 1991.
I'd have loved to see Yes, Judas Priest and Dream Theater about five to ten years ago but they have only rarely been near here (in Sweden, outside of Stockholm). Once almost got to see Yes and Judas at a festival but an extended family reunion came in between - ironically less than ten miles from the festival site! It was a hard rock festival and it wasn't near where I live; at the two-day reunion you were going to be formally dressed some of the time so I couldn't just slip off; I thoroughly enjoyed the wider family and friends get-together though..Less keen on seeing Dream Theater now, they are technically stunning but I feel they have gone a bit drier over the last few years, James LaBrie's singing has weakened and with Portnoy gone they're at a fork in the road. I'll check out their next album to see what happens..
I'm a jazz fan too, saw DeeDee Bridgewater at an open-air park show in Copenhagen a few years ago and she was killing. What a voice, and what an ability to bond with the audiece! Also seen James Brown live in the 90s - it was good, but not really great. I'd have wanted to make a time leap to 1972 and see him with Bootsy Collins in the band.