life:

October 18 marks the 50th anniversary of West Side Story, the acclaimed musical about two star-crossed lovers in 1950s New York City and the racial prejudices that keep them apart. In honor of the occasion, LIFE.com takes a look back at the evolution of the show—which made its Broadway debut in 1957 and was adapted into an Oscar-winning movie in 1961—from stage to screen.

(see more — ‘West Side Story’ A Look Back)