I was born in the late 80's so a lot of my musical heroes are long dead or have succumb to Sick Boy syndrome (see link).
So I really have no regret about missing a show because I couldn't have seen them while they were in their prime...or alive. Sooo I wish I could have seen:
-Bob Marley (my dad holds this over my head but I've seen Santana and he hasn't)
-70's Sabbath (Seen Ozzy many times and Heaven and Hell but I'd love to see them all young and in their angry hippie glory)
-Queen (with Freddy)
-Janis Joplin (anytime)
-Hendrix (with the experience)
-70's Thin Lizzy (Vagabonds era, when Brian Downey had that white streak in his hair)