Singer Diane Birch, center, and a choir perform at "The Music of Prince" tribute concert at Carnegie Hall on Thursday March 7, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Associated Press
Singer Diane Birch, center, and a choir perform at "The Music of Prince" tribute concert at Carnegie Hall on Thursday March 7, 2013 in New York. (Photo by Evan Agostini/Invision/AP)
Singer Diane Birch, center, and a choir perform at "The Music of Prince" tribute concert at Carnegie Hall on Thursday March 7, 2013 in New York. (Photo by Evan Agostini/Invision/AP)
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