I'm looking through the score now and the songs are extremely technical. Theres pretty much at least one key change in every song and some very technical rhythms. Obviously, Brooks, not being a musicain, was not responsible for these brilliant aspects, so I am very surprised that he is the ONLY one credited for the score.
Another thing I have noticed though, is that every song ends with a PLONK even slow songs like THAT FACE and TILL HIM. So even most of the songs are structured the same.
A little known fact is that in the original screenplay, Pan's Labyrinth was Pan's FLAByrinth. Hmmmmmmm...glad they changed it.