I love listening to music, and typically choose something based on the mood I wish to set. In the hobby, I usually pick something that is calming, creating a relaxed atmosphere; unless something else is suggested, of course.
In my personal life, however, it really depends on my mood, and how I want to get down... I know it has been mentioned numerous times already, but Nine Inch Nails - specifically from the album The Fragile, Left disk - is an all-time favorite of mine. It penetrates my soul in a special type of way... I actually just put it on because thinking about it made me need to hear it.
My number one go to, though, is a compilation of movie scores. Almost all instrumental, coupled with Enya and various other mystical voices...but a variety that ranges from the likes of Hans Zimmer, James Horner, Rachel Portman, John Williams, Thomas Newman, John Otway, John Elliott, Alan Silvestri... I could go on forever.
There's nothing like making love to Last Of The Mohicans.
I can get down to almost anything, though.