Keep in mind this before getting any big ideas, though:
Here's a suggestion: A Jukebox option at the main menu to let you listen to any of the game's songs at will. If the song names are spoilerific, perhaps only unlock that after the expansion has been finished once?

yes, that's a very nice idea! I like the music so so much!

Or Larian make a full cd or cdRom or dvd with the music on?
Cheers