I'll put the top one for each genre here and you can click on the link for the rest.
http://movies.yahoo.com/mv/news/ap/2...376538000.html
ANIMATION
"Snow White and the Seven Dwarfs," 1937.
FANTASY
"The Wizard of Oz," 1939.
GANGSTER
"The Godfather," 1972.
SCIENCE FICTION
"2001: A Space Odyssey," 1968.
WESTERN
"The Searchers," 1956.
SPORTS
"Raging Bull," 1980.
MYSTERY
"Vertigo," 1958.
ROMANTIC COMEDY
"City Lights," 1931.
COURTROOM DRAMA
"To Kill a Mockingbird," 1962.
EPIC
"Lawrence of Arabia," 1962.