Verdi, Otello: "Abbasso le spade... Gia nella notte densa" (Act 1) - The Duet begins at 3:12.

Kevin Hanek (Otello), Kathy Geary (Desdemona), from a live performance with the Delaware Valley Opera, June 23, 2012

This opera is based on Shakespeare's "Othello" translated into Italian in the libretto by Boito. This performance is in the Tusten Theater in Narrowsburg NY in 2012, with lovely natural acoustic sound from the wooden stage. It's is a pleasure to sing there.
This is from the end of the play as Desdemona reflects on the day and prepares for bed, with a lingering unnamed fear about her husband, Otello. She prays an Ave Maria and goes to sleep.