Where movies are concerned, a soundtrack essentially means "the songs that the people making the film picked to play over the scenes." In that sense, the act of creating a soundtrack is more of an exercise of careful selection than a truly creative endeavour - but there is a undeniable skill involved with doing such a thing. Especially when said soundtracks become later synonymous with the film. Quentin Tarantino has spent the sum of his career defining what it is to render a brilliant movie soundtrack; essentially, the man staples a track to a scene to the point where the scene itself is inseparable from the selected musical cue. Tarantino would have won three or four Oscars by now had this been a legitimate category, of course, though Martin Scorsese certainly would have given him a run for his money. Despite the fact that there are a lot of questionable elements inherent to "Best Soundtrack," it's hard to argue that it's a less relevant Oscar for "Best Original Song," most of which end up totally forgotten.