@DEVGRU That's because I never intended to mute/remove them in the first place, that's why. If you want to, be my guest; It's just as easy to mute the tracks yourself.

Figured where the L4D2 soudtrack bleeds. In the danger folder you haven't muted the sounds in subfolders: banjo, deviddle, dobro, internalorgans, saw and trumpet. slayer folder also has subfolders fiddle and lectic untouched and also not_a_laughing_matter isn't muted. I think it's easy for you to just mute those places and update your mod accordingly.

@RWBY The horde music is very specifically labelled.
L4D1? You probably won't hear it much, maybe a bit in The Sacrifice since I didn't make this with that in mind.
L4D2? "Horde Drums " If you don't want to hear the L4D2 music in hordes, just delete/mute all those tracks. Have fun though, there's a lot to do.

*these

There tends to be mixes between modded horde music and vanilla ones. Any way you can fix hear tracks?