Can you identify this aria??

Major noob here, hoping someone can tell me what this Russian girl is singing on YouTube:

http://www.youtube.com/watch?v=oZB-0VGMWys (Natalia Lopushanskaya)

I'm getting ready for a gig with a vocalist, and I want to see if she'll sing it (I play accordion, and I thought it was cool that the girl on YouTube is singing an opera aria with an accordion!)

It's "nessun dorma" from Puccini's turandot. Usually sung by a tenor. The language is italian. For a translation just google it - you should have more hits than you can handle!