Am I exaggerating in the headline? Maybe a little, but in watching Charles Burnett’s 1977 Killer of Sheep (IMDB link) last night I was extraordinarily moved throughout this strangely compelling and haunting film about life in mid-1970s Watts — equally so by the evocative music choices that complement it.
If the soundtrack is not available I’m going to hunt down the MP3s and make my own. Here’s a screensnap of the music involved (click to triplify):