Based on a couple of things she's said and influences in her music, I'd say Miley is into indie rock and country, but who knows?
A long time ago, I took a class in pop culture and the professor told us that the reason so many superstars blaze out in tragic ways is because we demand it. I always thought that was nuts; why would people WANT to see someone self destruct and why would anyone do that just because the public expected it? But apparently there is something to at least the first part of that; why else would so many people take pleasure in watching Lindsay Lohan stumble around and why are so many just waiting for Miley to get what's coming to her?
Maybe it's because so many stars are perceived as undeserving and thus somehow they "earn" bad ends; young stars seem to be a particular target of this, maybe because they aren't seen as having earned what they have. But it seems odd to me that so many people tell others that life isn't fair, get used to it, suck it up and stop thinking you're entitled to something better, and then turn around and rejoice that some undeserving star gets it right in the teeth.
"The secret to creativity is knowing how to hide your sources."-- Albert Einstein.
Taylor Swift had a songwriting contract when she was 14, well before she recorded anything, so I think it's safe to say she does more than come up with the concepts for her songs.
Two things are infinite: the universe and human stupidity, and I'm not sure about the universe.