Take Cover: Rihanna's 'Diamonds'

Not that the acoustic guitar part she's strumming is all that difficult, but Biederer gets points right out of the gate for playing her own instrument, while many other young women covering the song have a male accompanist join them on guitar. Mainly, though, the 16-year-old Atlanta native offers a refreshingly unaffected performance of the song, the power of her voice carrying the clip. Like Jade Novah, she imparts her own personality in the places where she lets herself deviate from the original – when she cuts loose and freestyles vocal runs near the end, her smile widening as she goes, it's a little bit of magic.

Performance: A

Presentation: B+