For the longest time I was brought up listening to only two genres of music, pop and rock. So in the past few years I've been trying to expand my interests because I think that you can only write to the extent of your knowledge, and if your knowledge is limited you can't write past that.
Material comes all kinds of ways, and it's never a question of a lack of material or a lack of projects - I have tons of projects. The issue is to convince someone to give you the money. And it's a very different business than it was just 8 years ago.