Listen to Introduction & Variations On a Theme of Mozart, Op. 9 online. Introduction & Variations On a Theme of Mozart, Op. 9 is an English language song and is sung by Andrew Keeping. Introduction & Variations On a Theme of Mozart, Op. 9, from the album Classic Guitar, was released in the year 2015. The duration of the song is 9:23. Download English songs online from JioSaavn.