The Decline of Western Civilization (1981) was funded by some folks usually in the business of producing porn, but director Penelope Spheeris instead created this imperfect but classic documentary of the Los Angeles hardcore/punk world of 1979/80.
Interviews and performances from the Alice Bag Band, Black Flag, Catholic Discipline, Circle Jerks, Fear, Germs, and X all provide a fascinating look at that period in musical history.
The full movie has been removed from Youtube,
but here are a few bits...
