Just as a matter of interest.
The audio tracks (music) are actually stored in a special "container" format on the CD (they are not genuine CD audio tracks).
I know that, for the Dig, there is a utility that enables you to extract the audio (music) from these "container" files but, it is my understanding this utility can also extract audio tracks from other Lucasarts games.
Lucasarts even released a separate soundtrack audio CD for The Dig, which is something I read somewhere about 4 years after the game was released.
Since I liked the soundtrack so much, I tried to obtain one of these CD's but, it was already out of print.
In the early 2000's, the entire soundtrack audio CD and another fan made game soundtrack were available for download in mp3 format. It even included some nice CD covers that one could print out.