Thanks, that was incredibly helpful! A new version is up, with the following changes:
- I lowered the bass strings by an octave, but it became hard to hear the melody of them, and they were too quiet anyway, so I just doubled them, at both octaves. A nice combination of resonance and melody, I think.
- The bass drums were also doubled, and increased in volume a little on top of that.
- I also lowered the horns by an octave, to make them more distinct from the strings. The tone is now more melancholy than sweet, but it does make for more variety.
- I took a few of the string parts and moved them to a celesta. Also added a tiny amount of harmony for the celesta.
If it's still too monotonous, I can play around with the arpeggio and the bass strings, but I'd rather not if I don't have to--when I was first playing around with this mashup, I was struck by how effortlessly the two pieces went together, and the more I diverge from the source material, including the harmonies, the less advantage I can take of that serendipity.