Madbrain: Hi proffrink1986,
Can't play right now to test, but when you install, there are CD audio tracks included in OGG format. So I'm pretty sure you get to listen to the amazing CD soundtrack in-game. That's one of reason I love GOG, they do all the hard stuff for us, so we just get to enjoy the original experience.
Also the game dir is so huge there just MUST be cut-scenes included - there's a very large "game.gog" file that I believe contains them.
The game.gog and game.inst files are just BIN / CUE raw CD image files with the extensions renamed (*.gog=*.bin and *.inst=*.cue). If you're curious about it's contents you can mount it with daemon tools or another virtual drive. I can confirm the cutscenes are on this image - DosBox is configured to mount it.
I can confirm the original redbook audio (CD-DA) is included. The tracks encoded in OGG format at approx. 100kbps 44.100kHz.
Edit: For those who prefer higher quality lossy formats I can confirm that 160 to 192kbps encodes worked fine when replaced in GOG's version - I re-ripped the tracks from physical media and tested.