> I've seen it performed "on TV" and it's on several albums.
A couple of years back, it was the subject of a copyright suit--some modern composer had done his own version, was sued by the Cage estate, and made a donation (in the low six figures, I believe) to some charity to settle the brouhaha.
> Is it wrong to listen to a recording of an opera?
No, just boring.
> Is it wrong to go to plays if you're blind?
The Columbia Masterworks LP of _Waiting for Godot_, with that excellent cast, is quite compelling.