when I'm mad, i'll listen to something softer just to lighten my mood up.
When i'm happy or just want to get pumped, i'll listen to anything heavy...Mostly hardcore techno & oldschool rap. When I'm in a completely zen mood, I'll be listening to acid jazz, trip hop and classical jazz. When I'm in-between, I'll just mash all my playlists together and listen to whatever comes up - 3500 songs offers LOTS of variety