...and somehow ends up in hell.
Satan is happy to see him, because Hell's band has been doing sound from the stage.
The devil shows the soundman his PA system, which is incredible, and the guy starts feeling pretty good about ending up down there.
Then the band starts to arrive, and it's John Bonham on drums, Cliff Burton on bass, and Jimi Hendrix and SRV on guitar.
The soundman asks Satan "How can this be hell? The PA is great and the band is unbelievable!"
Satan replies "Oh, our singer is a woman".
(found and re-posted from talkbass)