I don't think there are any songs that I've written in the past that I now disagree. It's kind of like tattoos; I would never regret a tattoo, because it was how I felt at that time in my life. I don't think I've ever said anything that I would take back. So far, so good! I would probably change the music, or change how I sing it, maybe do it a little bit cooler, or a bit more grown-up. But I don't think that there are any lyrics that I regret.
