I remember the game having CD music, is this an available feature in the GOG Release ?

While it's not available as a separate download, you can find the music tracks in OGG format in the MUSIC subfolder in your DethKarz installation directory.

And it also works in-game, obviously.

That's what i need to know. Thank you.

It kinda works in the game. On longer races it's noticable that the music plays only once, doesn't start again after a music file is finished.

I hope GOG fixes this bug.

i saved tracks from CD few years ago here it is
https://mega nz/file/wV5gzLpT#36gRCumoBPanMnjAUEuB_PXWZRPPeEqF_eE-q6re-_Q

i also noticed on pole short it played track 5 (gog) from cd not track 10 (gog)
also in menu it was track 2 (gog) and after it played track 3 (gog)