Listen to Quartet No. 2 in A Minor, Op. 51: I. Allegro non troppo online. Quartet No. 2 in A Minor, Op. 51: I. Allegro non troppo is an English language song and is sung by Hollywood String Quartet. Quartet No. 2 in A Minor, Op. 51: I. Allegro non troppo, from the album Brahms, Vol. 12 : Chamber Music, was released in the year 2011. The duration of the song is 9:47. Download English songs online from JioSaavn.