Edguy. Seriously, it feels lame, and almost embarrassing at first, but its very uplifting and happy. There is humor and all the music just feels jolly. the songs New Age Messiah, Rise of the Morning Glory, Fairytale, Lavatory Love Machine, Life and Times of a Bonustrack, Painting on the Wall, and Out of Vogue are all great starting points. Be disgusted all you want at the suggestion, but seriously, once you get past the "cheesy 80's" thing, its very cheerful stuff. I listen to it all the time after I finish working at my depressingly shitty retail job, and instantly it does the trick.