Natural Born Killers:
A Soundtrack for an Oliver Stone Film (1994)
The majority of film soundtracks (as opposed to film score albums) are little more than a collection of new or existing songs from different artists bundled together onto one disc.
Natural Born Killers' soundtrack is essentially the same. The biggest difference is that there was some actual thought and care put into structuring them, with custom edits and audio clips from the film itself used to connect the tracks into a more story-style structure.
It was compiled by Trent Reznor of Nine Inch Nails, who referred to it as a "collage of sound," which I guess is as good a description as any. It's the kind of thing that many of us used to do back when all we had was a double tape-deck, a VHS collection and plenty of patience.