I have replaced the F-14 Main menu theme with a theme from the Discovery Wings F-14 episode:
https://youtu.be/ew8NYGY5qnc
Just drop the Wings F-14 folder in: \Saved Games\DCS.openbeta\Mods\aircraft
After this you can select the theme in the Misc. tab in the Options.
All rights go to the Original artist:
Song: Momentum
Artist: De Wolf Music