I know its a misquote, but music does soothe the savage beast. I'm usually very happy and a "live and let live" type of guy, but sometimes when I don't get enough sleep (i.e. when I stumble across a website like this that keeps me up all night and I'm running on three hours of sleep) I get a bit short tempered. When that happens I have two options. I can either put on some music to calm down, or I can put on some music to keep my anger raging.
To soothe the savage beast within, I'll put on some Radiohead and just relax to it- usually anything off of Karma Police, especially Exit Music (For a Film). When I occasionally want to keep the rage building, I'll crank up any Pantera album. This being said, what do you listen to to calm down, and what do you listen to to keep the adrenaline pumping through your veins?