So I threw this list together in a couple days. Due to my unfamiliarity with many of the composers on it, it's probably royally screwed up, and is in no way meant to be final, absolute truth. I'm mainly just curious to see what y'all would/wouldn't change about it. So, without further ado...
50. Gunnar Berg
49. Claudio Monteverdi
48. Gustav Holst
47. Francesco Landini
46. Anton Dvorak
45. Milton Babbitt
44. Samuel Barber
43. Perotin
42. Arcangelo Corelli
41. Johann Fux
40. Maurice Ravel
39. Phillip Glass
38. Charles Ives
37. Guillaume de Machaut
36. George Gershwin
35. Leonard Bernstein
34. Henry Cowell
33. Johann Pachelbel
32. Jean Sibelius
31. Domenico Scarlatti
30. Georges Bizet
29. Giacomo Puccini
28. Georg Philipp Telemann
27. Giovanni Pierluigi da Palestrina
26. Edvard Grieg
25. Richard Strauss
24. Sergei Prokofiev
23. Felix Mendelssohn
22. Franz Schubert
21. Gustav Mahler
20. Sergei Rachmaninoff
19. Bela Bartok
18. Robert Schumann
17. Joseph Haydn
16. John Cage
15. Antonio Vivaldi
14. Frederic Chopin
13. Aaron Copland
12. Franz Liszt
11. Hector Berlioz
10. Igor Stravinsky
9. Pyotr Ilyich Tchaikovsky
8. Richard Wagner
7. Arnold Schoenberg
6. George Frideric Handel
5. Claude Debussy
4. Johannes Brahms
3. Wolfgang Amadeus Mozart
2. Johann Sebastian Bach
1. Ludwig van Beethoven