Who the $@#! Is Esperanza Spalding?

Who is this Esperanza person who robbed Justin Bieber of his Best New Artist Grammy?
?BiebLuv, via the inbox

Didn't think there was anyone out there who had better...

Bill O\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'Reilly Kate Moss Diane Sawyer Sean (Diddy) Combs