I'm not a fan personally - but when I see bands doing cover songs, I image its because the band themselves like the song, or have a great respect for the musician(s) who wrote and originally played it.

And, as well.. If music is your thing, as you get older - you're going to want to get away from the disney-bubblegum-popsongs. Shes either just trying to expand herself musically, or expand her fan base. I can't really blame her for either - because when something you love becomes a chore it just ruins it for you!

That being said, I tend to stick to original versions of songs regardless - covers tend to throw me off a bit. Though, I'd be interested to see what her next original album will sound like after shes done these songs... x3

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Just googled punk Miley for some lulz... It scared me instead. x(