Listen to Introduction and Variations on a Theme by Mozart, Op. 9: Variations 1 to 5 online. Introduction and Variations on a Theme by Mozart, Op. 9: Variations 1 to 5 is an Unknown language song and is sung by Julian Bream. Introduction and Variations on a Theme by Mozart, Op. 9: Variations 1 to 5, from the album The Essential Julian Bream [International Version], was released in the year 2008. The duration of the song is 6:03. Download Unknown songs online from JioSaavn.