In Manhattan’s Upper West Side, rival gangs of Polish-Americans and newly arrived Puerto Ricans clash for control of the neighborhood, even as two young members from opposite sides fall dangerously in love.

A documentary film about dancing on the screen, from its origins after the invention of the movie camera, over the movie musical from the late 20s, 30s, 40s, 50s, and 60s, up to the break dance and music videos from the 80s.