1. I am sort of between an alto and soprano. I've sung in a couple of choirs (school and church), and tend to alternate between first and second sopranos? Back in elementary school I was a descant, but I honestly don't know how I landed up there >_>
2. In the shower, or when I'm playing piano.
3. All sorts of stuff, from contemporary Christian songs to Jpop to Disney songs. Whatever floats into my head. Sometimes I'll even sing songs in random languages that I hear on the telly, and add my own lyrics as I go xD
4. I'm bearable. That is to say, I can sing (otherwise I'd have failed my piano aural tests!), but I don't think I sing well.