Nirvana........have only seen vids but talked to those that saw them......yeah, I missed out.
Alice in Chains.........see above
Jimmy Hendrix...........OK, I was too young, but........
Led Zeppelin.....in a real venue............saw them at the now-defunct Kingdome in Seattle (mid-70's).........couldn't get close enough to enjoy
Cure.......they are hard to describe.......I wanna see them.
......& obviously, the Beatles.........I was about 9 when they called it.