What's an adventure game soundtrack that lives rent free in your head?
I mean, obviously I'm biased, but Space Quest III just had one of the most amazing kick-ass soundtracks. Composed by Bob Siebenberg, the drummer from Supertramp!
Almost all of the Sierra games, but most especially King's Quest VI. Space Quest III and IV are definitely close, though.
I even have them all on my Plex server so I can listen to them anytime. Often in the shower. Oh, wait, TMI? Sorry.
This is what the inside of my head sounds like
you already know, The 7th Guest and 11th Hour lol