Hey, the challenge music doesn't play when starting a challenge/boss challenge

Man, I've been wanting this for ages, much appreciated

I believe the Soundtrack Menu mod has a tutorial on the mod page. Basically, you put the songs, in .ogg format, in the resources/music/[Name] folder, and the content/music.xml file links the song files to the corresponding in-game tracks. You can look at any of the already existing mods for reference, but I think the default ones that come with the Soundtrack Menu mod should be a good starting place.

Good mod, but Moldy, can you help me to make a mod with Soundtrack Menu?
I have a idea, but i don't know how to realise it