Listen to Variations on a Theme of Frank Bridge, Op. 10: Moto Perpetuo online. Variations on a Theme of Frank Bridge, Op. 10: Moto Perpetuo is an English language song and is sung by English Symphony and String Orchestras. Variations on a Theme of Frank Bridge, Op. 10: Moto Perpetuo, from the album A Portrait of Britten, was released in the year 1999. The duration of the song is 1:15. Download English songs online from JioSaavn.