Original Monkey Island theme is still my favourite bit of music from a game ever.
I wouldn't mind figuring out how to get a midi to sound like the PC speaker. Setting a square wave synthesizer as the instrument doesn't do it.
Then when the opening credits have finished and the game begins, there is background music for the lookout if you have midi audio, but silence for the PC speaker.
(check out his performance on youtube - not only the intro, but also the complete Woodtick theme, Jojo from MI2, etc.)
(And fwiw, my brother plays marimba and other percussion in MI4. To this day, one of the weirdest gigs he's ever had.)
1. http://www.supermarcatobros.com/podcast/tag/monkey+island
My young daughter will grow up with a vague knowledge of it as it - along with the theme to Monty Python's flying Circus - are the two tunes I hum to her to get her to sleep.