I tend to prefer instrumental or electronic selections for background music
during demo times, as music with vocals can sometimes interfere with your
own voice. Selections I like include:
Kaki King (instrumental guitar, often bright, upbeat and fast-moving)
Massive Attack (some tracks, anyway)
Sound Tribe Sector 9 (electronic, some minimal vocals)
Thievery Corporation (some tracks)
Boards of Canada (this is a must-listen, if you haven't--incredibly
talented electronic musicians, no vocals)
I haven't had the internet at home for a while, but when I did I used a
tool called Last.fm to track the music I listened to:
http://www.last.fm/
and
http://www.last.fm/user/joshnumbersbad
if you'd like to see my more general music selections. :)
-- Josh