As a piano player of 7 years, I've learned to love and respect the art of classical music. It has also opened my eyes to the wonders of writing music as well.
I'd have to say my favorite composer is Hans Zimmer, who did the Lion King soundtrack, Inception soundtrack, co-produced the Dark Night soundtrack, the Madagascar sounstrack, the Pirates of the Caribbean soundtrack, and many more.
Of course, then there's Tchaikovsky, John Williams, Danny Elfman, Joe Hisaishi for sure, Bach, Beethoven, Chopin, and more.
So, discuss your favorite composers.