What is the name of the operatic piece that Andy plays over the loudspeakers in shawshank redemption

Duettino - Sull'aria
From opera "Le nozze di Figaro (The Marriage of Figaro)"
Composed by Wolfgang Amadeus Mozart
Libretto by Lorenzo da Ponte (uncredited)
Performed by Edith Mathis (uncredited) and Gundula Janowitz (uncredited)
Chor und Orchester der Deutschen Oper Berlin
Conducted by Karl Böhm
Courtesy of Deutsche Grammophon, by arraingement with PolyGram Special Markets

Here you go:
The Shawshank Redemption (1994) - Soundtracks - IMDb (http://www.imdb.com/title/tt0111161/soundtrack?ref_=tt_trv_snd)

Sorry my stupidity is infinite. Thank you for answer to my origonal question

Sorry your stupidity is no more than 99% of us.
'We are all bozos on this bus.'
'All the world's a stage, and we are stooges.'
Etc
Etc