I apologize if someone has already posted the bellow-noted listing somewhere else.
On the Yahoo Movies discussion list under "Silent Hill" (Go to Yahoo>Movies>Silent Hill>Message Board, for those unfamiliar with Yahoo - and get yourself a warm feeling when you compare the level of discussion here with theirs!

), the intro post under the topic "For those who want the songs from the movie", there's a list of 23 songs and which game they come from, as well as a URL where the poster, "potbellyraccoon", states that they can be downloaded, though I haven't tried his link. I checked the list against my own impressions and I think he's essentially correct.
(I didn't link directly to his post, as some BBs I've been on have had rules against linking to other forums so I never do at a new one until I'm sure of forum rules and unstated local customs.

)
The game music is available on CD, for those who are still looking for that. An outfit called "Import King" has been selling them on Amazon.