God, the boring relative everyone ignores--no one calls, no one writes--until they need a serious favor.
When I'm creating characters, I definitely think of theme songs. Writing for me is very visual, so I sometimes think of it in terms of a movie with a soundtrack, and try to transfer that to words.
Occasionally when I'm procrastinating writing, I'll while away the hours on iTunes. You can just keep going forever and find these bands you'd never normally hear of.
I believe writers need to be chameleons, or like Meryl Streep, who can play all sorts of characters. A good writer should be able to cross gender lines and people of all social classes. So for me, writing from a male point of view would be a great challenge, that I would look forward to taking on.
I haven't always been a writer and I suppose I tiptoed around the idea of writing full time, because it's so isolating.