This is a package of the vanilla music in use by older versions of this mod. Just place the content of the downloaded folder inside of the WotN_RF/data/sounds-folder (the submod) or the WotN/data/sounds-folder (the Main Mod) - before doing this you can move the custom mod-files already there to a backup-folder if you wish to keep the mods custom music as otherwise you'd be replacing the custom music of the mod. Youtube has a tendency to block the mod if played with the custom music, and force the player to mute all the sound - using the vanilla music instead this won't be an issue for let's players of this mod.