Typically, my playlist is dominated by Rush. I don't know that there's a mood or a time that they don't have a song that's appropriate. Of course, YMMV ;)

That's not all I listen to though. If I'm feeling more laidback, I like listening to music such as Pink Floyd and Collective Soul. If I'm angry or agitated at a coworker, or just generally frustrated, I switch to the likes of Nine Inch Nails, Front 242, KMFDM, Prodigy, etc. And if I need to concentrate or wrap my head around something difficult or foreign, nothing beats the sound of silence.

MrCromeDome