The Decline of Western Civilization Part II: The Metal Years is a 1988 documentary film directed by Penelope Spheeris. Filmed between August 1987 and February 1988, the film chronicles the late 80s Los Angeles heavy metal scene. It is the second film of a trilogy by Spheeris depicting life in Los Angeles at various points in time as seen through the eyes of struggling up-and-coming musicians.

https://en.wikipedia.org/wiki/The_Decline_of_Western_Civilization_Part_II%3A_The_Metal_Years