Board Thread:Music Packs/@comment-28792040-20161128025412/@comment-27190591-20161227114024

Create a new Music Pack with only this track: http://lotrminecraftmod.wikia.com/wiki/File:Utumno_Fire.ogg

This is definetly a valid .ogg, and it works for me. It the pack with this file works, then you had a problem with the .ogg's. If not, I advise you to reinstall Minecraft.