Il mio tesoro

[1] In the aria, Don Ottavio, a young nobleman, urges the listener to assure his (the nobleman's) beloved fiancée, Donna Anna, that he intends to secure vengeance for her against the man who murdered her father.

The aria is set in B-flat major and in cut common time (), with tempo indication of Andante grazioso.

[1] For most of the piece, the violins and violas play con sordino (with mutes) for a mellow effect.

In addition to the strings, the aria uses clarinets in B-flat, bassoons and B♭ alto horns.

A concert performance of "Il mio tesoro" is mentioned in the opening paragraphs of Tolstoy's novel Anna Karenina[2] Excerpts from it are sung by the protagonist's father in the 1949 black comedy film Kind Hearts and Coronets.