User blog comment:Henzukaya/Dark Souls location theme songs/@comment-6003396-20140110192542

While taste in music is highly subjective, you might find some tracks from the Diablo II OST to fit in with Dark Souls. The music from Diablo II creates a great atmosphere of isolation, hopelessness and perseverance, themes that are shared with Dark Souls.

The whole OST is great, but some that might work particularly well with Dark Souls are:
 * Wilderness - Darkroot area, I guess, but might work elsewhere. It's an 8 minute track that moves through different themes, so less repetition over extended periods of time.
 * Rogue and Sisters- You don't have this area listed, but I think these would work well as alternatives with Firelink Shrine, maybe elsewhere. They're separate tracks, but they transition seamlessly from Rogue to Sisters.
 * Cave - Blighttown. Could work elsewhere. Starts slow but builds up to create a sense of urgency and danger, even a bit of dread.
 * Crypt and Tombs - The Catacombs and Tomb of the Giants (would be the obvious choices).

I could go on. Many tracks transition seamlessly into the next. If you liked some of the ones I've listed, I would recommend listening to the whole thing. Runs about an hour, not counting the tracks from the expansion, which has an entirely different feel.