Classical music.
As I said, my favorite composer is Sergei Rachmaninoff. Here are some links to the sites with his biography and music.
Sergei Rachmaninoff(1873-1943)
Rachmaninoff's music in RealAudio (in Russian) Rachmaninoff site (in Russian) Rachmaninoff sheet music Rachmaninoff pages Rare compositions of Sergei Rachmaninoff (in Russian)
More classical composers' sites:
Johann Sebastian Bach(1685-1750) Wolfgang Amadeus Mozart(1756-1791) Ludvig Van Beethoven(1770-1827) Franz Peter Schubert(1797-1828) Frederic Chopin(1810-1849)
More Midi Files Here and Here