Zeppelin (saw the Reunion in 2007 but too young for the hey days)

Nirvana (had an opportunity but preferred beers on the weekends, i was young so priorities differed)

13th Floor Elevators

Beethoven

Leadbelly

Johnny Cash

but luckily ticked off my wish list pretty well. from those alive it's really only Tom Waits i would love to see, but the dude isn't about much. Oh and Rodriguez.