Tegan and Sara, Mike Posner, Sia, Janelle Monae: Who else should be bigger than they are?
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Demi Lovato isn't underrated because she isn't beloved: it's because she isn't appreciated by more grown-up audiences. Her big-voiced, big arc future hasn't quite caught up with the successes of her Disney past (and she doesn't date Justin Bieber, a luxury that a different Disney upstart had).