Who was the best composer of the 20th century?

Leonard BernsteinAn American composer of classical and popular music, a music educator, conductor, songwriter and pianist. He studied at two of the finest educational institutions in the U.S.; namely Harvard University and Curtis Institute of Music. Bernstein became the musical director and conductor of the New York Philharmonic and was inducted into the Songwriters Hall of Fame in 1972.

Ernest BlochErnest Bloch was an American composer and professor during the early part of the 20th century. He became music director of the Cleveland Institute of Music and the San Francisco Conservatory; he also taught at the Geneva Conservatory as well as the University of California at Berkeley. Benjamin BrittenA conductor, pianist and a major English composer of the 20th century who was instrumental in establishing the Aldeburgh Festival in England.

The original venue of the said festival was at Aldeburgh's Jubilee Hall. Eventually, the venue was moved to a building that once was a malthouse at Snape, but through the efforts of Britten, was renovated into a concert hall. Ferruccio BusoniItalian/German composer and concert pianist of the 20th century.

Aside from his operas and compositions for the piano, Busoni edited the works of other composers including Bach, Beethoven, Chopin and Liszt. His last opera, "Doktor Faust," was left unfinished but was later completed by one of his students. John CageAmerican composer of the 20th century known for his innovative, avant-garde ideas of creating and appreciating music.

Many consider him a genius, though there are those who think otherwise. One of his most famous work is 4'33"; a piece where the performer is expected to remain silent for 4 minutes and 33 seconds.