It's a bit out of topic, but I think it's interesting. An article called Happiness: Enough Already, has a nice pic of Moz in good company with a subtitle that reads:
Grief Is Good: Aristotle saw melancholy as muse. Bright stars who suffered dark moods: Van Gogh, Lincoln, Dickinson, Allen and Morrissey.
here is the link:
http://www.newsweek.com/id/107569




but I found the article very interesting and I didn't expect anyone here to actually know the authors or participate in this study 