Listen to String Quartet No. 6 in B-Flat Major, Op. 18: II. Adagio ma non troppo online. String Quartet No. 6 in B-Flat Major, Op. 18: II. Adagio ma non troppo is an English language song and is sung by Beethoven Quartet. String Quartet No. 6 in B-Flat Major, Op. 18: II. Adagio ma non troppo, from the album Beethoven Quartet Plays Beethoven, Vol. 1, was released in the year 2008. The duration of the song is 5:56. Download English songs online from JioSaavn.