Ennio Morricone is probably the most famous film composer of the century. He is also one of the most prolific composers working in any medium. No exact figure is available, but he's scored several hundred films over the past several decades.
Sergei Vasilievich Rachmaninoff 1873 – 1943 Russian-born composer, a virtuoso pianist, he excelled at the interpretation of the late romantic composers. - Sergei Rachmaninoff plays his Piano Concerto No.