This is the version featured in The Shawshank Redemption (1994). Great choice, it's exceptionally beautiful. Sung by Edith Mathis & Gundula Janowitz.

"Sull'aria ... che soave zeffiretto" (On the breeze ... What a gentle little Zephyr) is a duettino, or a short duet, from act 3, no. 21, of Wolfgang Amadeus Mozart's 1786 opera The Marriage of Figaro, K. 492, to a libretto by Lorenzo Da Ponte. In the duettino, Countess Almaviva (a soprano) dictates to Susanna (also a soprano) the invitation to a tryst addressed to the countess' husband in a plot to expose his infidelity.