2. West Side Story (1961)
Natalie Wood doesn't make the most believable Puerto Rican Juliet to Richard Beymer's pretty-American-boy Romeo. But choreographer and codirector Jerome Robbins injects the opening gang-warfare finger-snapping ballet and other big numbers with so much energy, it carries the whole thing along. Genius scene: The edgy, angsty, jazzy setpiece ''Cool,'' which feels like a nihilistic '50s teen-rebel movie on drugs. Kudos to composer Leonard Bernstein and lyricist Stephen Sondheim for the most sophisticated score ever to go mainstream.