Listen to Variations on a Theme by Haydn in B-Flat Major, Op. 56a online. Variations on a Theme by Haydn in B-Flat Major, Op. 56a is an English language song and is sung by Austrian Radio Symphony Orchestra and Milan Horvat. Variations on a Theme by Haydn in B-Flat Major, Op. 56a, from the album Top 200 Classics, Vol. 2: The Rest of the Very Best of Classical Music, was released in the year 2013. The duration of the song is 5:36. Download English songs online from JioSaavn.