If you could bring back one great artist that has

departed our world who would it be? We have lost some incredibly talented artists, often under tragic circumstances. If it were possible to have an encore I would vote for Janis Joplin. You?
Duane Allman and Barry Oakley. Keith Moon, Gustav Mahler..... So much genius has departed this mortal coil, the list could go on forever.
Beethoven. Toward the end of his life, he was outgrowing the traditional classical symphonic and chamber forms of his time. With the various instruments, both acoustic and electronic, available today for him to play with, and the additional genres for him to hear (I'm assuming we could fix his hearing too), I think the results would be awesome.

In rock, while there are many fine choices already mentioned, I'm with Jaybo, I miss the work of Clarence White.
Rcprince has an interesting point with that perspective, and I think it's one fair answer to my mild "philosophical objection" above. I have to admit, I'd be curious myself... or maybe this: "Rock Me, Amadeus!"
It would have to be Duanne Allman or Jimi Hendrix
I would have loved to see what directions there talent would have taken them.