Listen to Sting Quartet in E Major, Op.74 "Harp": IV. Allegretto Con Variazion online. Sting Quartet in E Major, Op.74 "Harp": IV. Allegretto Con Variazion is an English language song and is sung by Vladimir Fedoseyev. Sting Quartet in E Major, Op.74 "Harp": IV. Allegretto Con Variazion, from the album The Complete Masterworks of Ludwig Van Beethoven, Vol. 31, was released in the year 2012. The duration of the song is 6:31. Download English songs online from JioSaavn.