I can hear the PC Speaker music in my head.... oh man! it was actually available in adlib! https://www.youtube.com/watch?v=ayInv3ZZRak
My old PC wasn't good enough to play the game. You could almost see each frame render. However, the PC speaker music was really nice and I used to run the game just to listen to that.
I actually came here to post this. It's iconic music, bleeps and bloops!
I used the MT32 audio. Not only because it sounded better, but because it would overload the CPU and slow down the game making it playable on my Pentium 75.