Hello there! This brand new "mod" contains every song that you can get by obtaining the DLCs and mods for Crusader Kings 2, by adding new song files for you to listen to. I would recommend making a saved copy of your "Crusader Kings 2/" folder before installing this "mod", due to possible checksum problems in Multiplayer (normally adding new files should not influence the ability to play in Multiplayer, but anything can happen really).
So a problem arose with the released Epic Music Mod, some songs weren't presented and one particular song was repeating itself. This is a new and updated version of the "songs.txt" file that the mod uses, so after installing the mod, be sure to download this file and overwrite the already existing "songs.txt" file in your Crusader Kings II/music folder in order to fix the issue.