use this: http://www.nexusmods.com/skyrim/mods/8303/? fallout 4 uses the same audio format As for implementing, i suggest fo4edit http://www.nexusmods.com/fallout4/mods/2737/? Music is defined in the "Music Track" header (this is where you define a single track) and the "Music Type" header (these are the playlists you want to add your custom songs to) hope that helps!