I was just reading a thread on the Interaction Design Association group site and one member announced today that she distilled a previous group discussion and published it in her blog on webgrrls.com. If you haven't seen it, check out Kristin Vincent's blog topic: Online Music to Help You Design.
The IXDA group, which we both belong to, had a lively back-and-forth discussion about music to design to, and Kristin sifted through it, and published the results on her blog. Have a look! --Its got some great suggestions, focusing mainly on web-based music sources, but also briefly talking about specific artists/genres people enjoy.
Kristin's Webgrrls Blog"