There is something like a "Di Rigori" contest going on in YouTube, including a lot of versions I haven't heard. Here is Mario Lanza:
And how about Jonas Kaufmann:
We've hardly started. Here is Piotr Beczala:
Have I posted anything by Fritz Wunderlich before?
This is a nice bunch, but why stop now? I'm very fond of Domingo's version:
Can we end without Pavarotti?