For Mozart presumably his years of musical experience (and training) as a child prodigy helped him become an excellent composer early in life. Symphony #25, co

For Mozart presumably his years of musical experience (and training) as a child prodigy helped him become an excellent composer early in life. Symphony #25, composed by Mozart at 17 (and used as opening music in the movie Amadeus) is pretty great. Sadly Mozart died at 35 (unlike his friends the Haydns who had successful careers into their 60s.)