As long as we're talking about operatic performances, here are two from the single performance that convinced me that opera is fucking awesome, and is NOT for stuck-up old people.
This whole thing is just masterful, but, especially, listen to the part starting at 3:50, and, double-especially, listen to the part starting at 5:25. How does someone squeeze THAT much mocking tone into something sung THAT fast?
Particularly the parts between 1:50 and 2:30, and everything between 3:05 and 6:15.
How do you get a human voice to do that? I'm convinced that Cecilia Bartoli is actually a robot, not actually a human. They don't make actual human beings with voices that can do that. LOL
In terms of Nessun Dorma -- Honestly, THE single most amazing live performance of a song I've ever seen was a performance of Nessun Dorma... by Sarah Brightman.
Here's a live recording from youtube. (Not the same concert I went to -- I saw her here in California)
It's a bootleg recording, so the sound quality is crappy, but, you can get a sense of what that was like. It was amazing, overwhelming, and totally unexpected -- especially considering that Nessun Dorma is a male part, and is also, to be perfectly honest, sort of played out as a "go-to" song for showing off vocal ranges and suchlike:
And, finally, there are some of the Seattle singers, whose voices may have literally saved my life, back in my darker days. I still can't hear "Say Hello 2 Heaven", by Temple of the Dog (Chris Cornell on vocals), without bursting into tears.
And, as long as I'm already crying a fucking river...