Listen to Introduction and Variations on a Theme by Mozart, Op. 9: Theme: Andante moderato online. Introduction and Variations on a Theme by Mozart, Op. 9: Theme: Andante moderato is an Unknown language song and is sung by Julian Bream. Introduction and Variations on a Theme by Mozart, Op. 9: Theme: Andante moderato, from the album The Essential Julian Bream [International Version], was released in the year 2008. The duration of the song is 1:17. Download Unknown songs online from JioSaavn.