Really? You didn't think Yamaoka brought his A-game? Honestly, I feel that he's absolutely great in this one, and certainly able to stretch his musical legs given the fact that he's not stuck doing dreary, soulful, or machine-riddled soundtracks that Silent Hill always demanded. Make no mistake, he's certainly great at that, but if you pay any attention to Konami's music games scene, you'd find he has a presence there doing some more experimental stuff.
I thought the Spanish guitar was particularly lovely.
Also, you didn't bring up the awesome storybooks that gave backstory on the bosses, narrated by either Johnson or Garcia, depending on the situation. I loved those, even if they were unskippable once you began.