In order to hear the music during the game, your speakers must be connected to the audio output of your CD drive or you must have a CD audio cable from your CD drive to your sound card. If you don't hear music, simply plug your speakers or headphones into the audio output on the front of your CD drive.
-Excerpted from "Monkey Island 1&2 Double pack"
I'm not sure if this helps with Bounty Pack.
They don't call me the Bone Master for nothing