Listen to Introduction and Variations on a Theme by Mozart, Op. 9 online. Introduction and Variations on a Theme by Mozart, Op. 9 is an English language song and is sung by Andrés Segovia. Introduction and Variations on a Theme by Mozart, Op. 9, from the album Romantic Music Playlist, was released in the year 2013. The duration of the song is 3:24. Download English songs online from JioSaavn.