Miss the original Fallout menu music? While the vanilla menu music is good, for me it got stale after a while so I decided to replace it with the classic menu music from Fallout 1 and 2, composed by Mark Morgan.

The music is available via public domain, so there should be no legal issues.

Installation:

Nexus Mod Manager (now Vortex).

OR:

Replace the original file manually. To do this go to Data, Music, Special (if there is no Special folder, create one inside the Music folder) and place the .xwm file inside.

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I'd recommend also using Jiveo123's Classic Fallout Main Menu
http://www.nexusmods.com/fallout4/mods/25937/?#

OR

Jarf's Classic Fallout Menu Replacer
http://www.nexusmods.com/fallout4/mods/12862/?

OR

BIOHAZARDCURE's Fallout 2 Theme Main Menu
http://www.nexusmods.com/fallout4/mods/24430/?