Try playing Noel Coward during a dungeon crawl. I haven't, but I dare surmise that it would be, how do you say, a mistake. Even if you include the distinctly non-Grandmotherly Monty Python 'Not the Noel Coward Song'.
And to defend my own listening habits:
It's scary just how much metal and JPop gets pumped out at my game evenings... but that's not the point. I don't recall playing Aqua, even though I do enjoy their somewhat evil songs... (Yes, if you listen to the lyrics they're very funny), but I
have booted up Quake while (unbeknownst to me) the Sound of Music was in the CD drive, and that was
hilarious. Enter dungeon. Music swells in the background, unnoticed until the first horrible monster appears, at which point you realise there's a full orchestral score that bursts into magnificent song at the precise moment your foe explodes in a hundred bloody pieces.
Wait, I just realised that I first got hooked on Aqua playing Exile III (see
http://www.spidweb.com for a demo if you haven't already), which is pretty heavy on the dungeon crawls. I'm officially insane.
At least I got hooked on Garbage playing Wizardry VI...