I recently played (sortof) the Silent Hill series, and beat 2 & 3. I haven't played 1 yet, but so far I'm really digging the soundtrack. All composed by Akira Yamaoka (except for the upcoming Silent Hill 8)
Silent Hill 2 had the BEST opening song ever, and in general best song EVER. The song's title makes more sense after you have beaten the game.
Silent Hill 3 had some interesting songs, but so far the sound effects in the game were probably the best. Not to mention that I thought Silent Hill 3 was wayyy scarier near the end.