You can now watch the classic graffiti and hip-hop documentary "Style Wars" (1983) over at archive.org (with a hardcoded Spanish subtitle however).

The synopsis taken from the official documentary site:

Directed by Tony Silver and produced by Tony Silver and Henry Chalfant, it was awarded the Grand Prize for Documentaries at the 1983 Sundance Film Festival. STYLE WARS is regarded as the indispensable document of New York Street culture of the early '80s, the filmic record of a golden age of youthful creativity that exploded into the world from a city in crisis.

STYLE WARS captured the look and feel of New York's ramshackle subway system as graffiti writers' public playground, battleground and spectacular artistic canvas. Opposing them by every means possible were Mayor Edward Koch, the police, and the New York Transit Authority. Meanwhile MCs, DJs and B-boys rocked the city with new sounds and new moves and street corner breakdance battles evolved into performance art.