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Update on the blood moon track, I found out that it plays the vanilla track in the snow and jungle biomes, the new track plays correctly elsewhere.
Also there appears to not be a music box for the new blood moon track.
Your mod is amazing but the Eater of Worlds has a theme but it doesn't play, instead Normal version is played, same goes to the frost Legion. The destroyer doesn't have a theme and plays nothing, doesn't even have a music box. Keep up the good work.
Only issue of course is that the custom music is very loud compared to the vanilla music. But I think other people have already told you that.
Haven't had a chance to fiddle around more, will report back later.