I have not gained specific permission to distribute it, but since the artist have made it public domain I see no reason to as I'm not trying to make money off it.
The artist is called Kenneth Ansberg aka Alien Hand. The music is very ambient compared to the standard soundtrack which seems a bit too emperical march like to me

So if you just want a nice ambient sound in the background this mod is for you.
Just download and extract into your customization folder. Then change the theme to the Alienhand mod.
File one
File 2
Final file
Now conquer the galaxy to the sweet electronic beats.