Listen to Brahms: String Quartet No.3 In B Flat, Op.67 - 3. Agitato (Allegretto Non Troppo) online. Brahms: String Quartet No.3 In B Flat, Op.67 - 3. Agitato (Allegretto Non Troppo) is an English language song and is sung by Melos Quartet. Brahms: String Quartet No.3 In B Flat, Op.67 - 3. Agitato (Allegretto Non Troppo), from the album String Quartets: Works by Johannes Brahms and Joseph Haydn, was released in the year 1969. The duration of the song is 8:24. Download English songs online from JioSaavn.