I think this only works without the disc.

I think if you have a music disc in the computer you can launch big rigs and you have music!
I think it's pretty cool.
So now you can while playing big rigs!

i've never had the music work for me.

Are you using the disc version?
Cause I don't think it works on the disc version
But if you aren't on the disc version maybe only some discs will play.

I've played disc, no disc EVERYTHING.

you are a lucky man.

it happened to me too, it was

I think it will randomly play any one of tracks 2-6 on the disc

Ah. No doubt an oversight by Stellar Stone. The DVD includes those tracks in MP3 format. In order to hear the Big Rigs music, one would have to burn a CD of it.