Listen to Beethoven: String Quartet No. 6 in B flat, Op. 18 No. 6: 2. Adagio ma non troppo online. Beethoven: String Quartet No. 6 in B flat, Op. 18 No. 6: 2. Adagio ma non troppo is an Unknown language song and is sung by Guarneri Quartet. Beethoven: String Quartet No. 6 in B flat, Op. 18 No. 6: 2. Adagio ma non troppo, from the album Classical Weekend: Beethoven, was released in the year 2021. The duration of the song is 7:10. Download Unknown songs online from JioSaavn.