When I started out gaming in the 1980s I was never bothered about music in my games, but I used to always listen to it when I was designing stuff.
I used to write up a lot of stuff for my basic red box D&D games, fantasy adventures in which I'd try to emulate my two favourite fantasy things at the time, the John Boorman movie Excalibur and the HTV show Robin of Sherwood. I designed a fantasy version of middle England and I'd listen to classical music while I did it. I've still got my notes here - I'll scan or photograph them sometime and put them up.
The music of choice was Beethoven, and I'd usually listen to his Fifth Symphony. It's a famous piece but most people can't get past the dot-dot-dot-dash V for victory opening. The rest of the piece is incredible. In fact, it's become so embedded in my memory as a piece of music associated with my 1980s roleplaying and basic D&D in particular that every time I hear it, it sends me back to the tiny box room that was my bedroom, and the hours I spent under a lamp scribbling notes, drawing maps and imagining grand adventures in my make believe country. It was a grand time, when creating and designing were just as important as the game itself.
I've been a bit lacklustre in my creativity lately, mainly due to time constraints, but I'm wondering if putting on some Beethoven might stoke my creative fire.
Hey - it worked twenty plus years ago.