Song from South Park, 3-26-03

On last night’s 9:30 episode (repeat) where the boys host the Romanian gymnasts, the sub-plot involves Kenny embarking on a singing career.

He is sitting on his bed listening to a tape of voice lessons. The instructor on the tape runs him through a couple of warm-up exercises, then says " Now we will sing the entire ------," and names some classical opera piece whose title I can’t understand.
Kenny then launches into an hilarious rendition of a beautiful, but muffled, classical song.

I instantly recognized the tune. It has been appropriated into a pop song of the past couple of years, but I know neither the title or artist involved there, either.

Are the any classical music / South Park fans who could help me get the name of this song? Thanks.

He sang Conte Partiro.

Thanks, JuanitaTech , that’s it!

Juanita tech: Did you install some switches at my place of business?

Was I supposed to?