What r some good singers??

Well... I like Britney Spears, Hilary Duff, Marion Raven, Aly & AJ, Madonna, etc... so if u know any good artists like them who sing good pop, could u tell them to me??
Update: I obviously know beyonce, christina aguilera, and other famous artists... what I'm looking 4 are some unknown artists... like Cheyenne Kimball or that stile!!
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