A documentary film about dancing on the screen, from it's orgins 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 the music videos from the 80s.

In the slums of the upper West Side of Manhattan, New York, a gang of Polish-American teenagers called the Jets compete with a rival gang of recently immigrated Puerto Ricans, the Sharks, to "own" the neighborhood streets. Tensions are high between the gangs but two romantics, one from each gang, fall in love leading to tragedy.