I'm with GMan, it depends if I want to stay there for a bit (and work my way out), or if I need to get out as fast as I can! If I'm going to stay there, I've got plenty of depressing singer songwriters/alt-rock stuff. If my wife hears it, she knows I'm in a sad state. If I'm angry (like a pissy day at work), out comes the Anthrax, Testament, and such. If I've had a bad day but I need to get better quick (especially around the family), I put stuff on that is upbeat, filled with melody, and makes me want to sing a long. Note: don't put trite music on if you are in a mood, it'll make you want to strangle your speakers!