Yeah, I made a soundpack mod, Quin.
A couple come to think of it:
Here’s one with public domain music that was too violent for Fallout.
And here’s some Creative Commons instrumental music that I think sounds like it was played in the desert on an acoustic guitar by robots.
vongrimmsy0, I will check the build, but did you quit to desktop? You gotta quit to desktop after doing all that.
Edit: It works for me! I unzipped it to data/sounds, (which you did too, if you selected it) selected it in the options, quit to desktop and restarted the game.