I realized that I don't have more than 5. That's because I might not even be a film music fan, but just a big fan of John Williams, who happens to write music for film. A difference.   That said, I discovered Jerry Goldsmith too, but for me, he's FAR behind JW (still number 2, though).   For me:    1. John Williams  2. Jerry Goldsmith  3. James Horner   4. Henry Mancini  5. John Barry