According to Entertainment Weekly!!

25 Greatest Movie Musicals of all Time

25. Once
24. Seven Brides for Seven Brothers (1954)
23. The Music Man (1962)
22. Gigi (1958)
21. The Beauty and The Beast (1991)
20. Funny Girl (1968)
19. The Sound of Music (1965)
18. The Busby Berkeley Disc (2006 compilation)
17. Chicago (2002)
16. A Star Is Born (1954)
15. Hairspray (2007)
14. Grease (1978)
13. On the Town (1949)
12. Swing Time (1936)
11. An American in Paris (1951)
10. Love Me Tonight (1932)
9. Meet Me in St. Louis (1944)
8. South Park: Bigger, Longer & Uncut (1999)
7. A Hard Day's Night (1964)
6. The Band Wagon (1953)
5. Mary Poppins (1964)
4. Cabaret (1972)
3. Singin' in the Rain (1952)
2. West Side Story (1961)
1. The Wizard of Oz (1939)