Mostly it's different subgenres of rock and metal (like 70% of all comments here. Seriously, I've never met so many ppl that listen to my favorite music in one place xD).
I kinda have a few moods. For the "fun and energetic" mood I have hard rock and heavy metal, for the "my job is f*cking me and I don't like it" I have nu metal and some other things that sound angry, for the "fancy" I have a strange mix of P!atD, Franz Ferdinand, some songs that are creepy/sad but sound happy ("I can't decide", "Don't fear the Reaper", "To The Sea") and steampunk/dark cabaret/murder song bands (Voltaire, Coppelius, the Cog is Dead, American Murder Song)