Evelyn said I short changed you on this post from a couple weeks ago. Consider this quote:
The best musicians are like the best programmers – and like the best bloggers, although notice I didn’t say the most popular bloggers – they do it because they can’t not do it. They write and/or play music for the same reason a writer writes: it’s how they breathe. And it’s as involuntary as breathing. Most of them can’t tell you why they do it. They just do, and they love it.
This may help you consider reading the whole post.