Listen to Sextet for Clarinet, Piano and String Quartet: I. Allegro vivace online. Sextet for Clarinet, Piano and String Quartet: I. Allegro vivace is an Unknown language song and is sung by Aaron Copland and Juilliard String Quartet. Sextet for Clarinet, Piano and String Quartet: I. Allegro vivace, from the album A Copland Celebration, Vol. II, was released in the year 2000. The duration of the song is 4:20. Download Unknown songs online from JioSaavn.