Aaron Copland was a man that had a very specific point of view about what music should be which was that, he felt that new music should have the composer should show a personality in his music.

String Quartets Nos. Complete Music for Piano. Each instrumental voice is typically assigned its own set of tempos.

Elliott Cook Carter Jr. His last work Epigrams for piano trio was completed on August 13 2012. (December 11 1908 – November 5 2012) was an American composer who was twice awarded the Pulitzer Prize.