This Fall 2012 publicity photo provided by Rogers and Cowan shows musician 

This Fall 2012 publicity photo provided by Rogers and Cowan shows musician Prince performing in concert in Chicago. Prince turns off the lights at South by Southwest on Saturday, March 16, 2013, with an unexpected and intimate showcase that ranks among the biggest surprises in years at the star-studded music festival and conference. (AP Photo/Rogers and Cowan)
Associated Press
This Fall 2012 publicity photo provided by Rogers and Cowan shows musician Prince performing in concert in Chicago. Prince turns off the lights at South by Southwest on Saturday, March 16, 2013, with an unexpected and intimate showcase that ranks among the biggest surprises in years at the star-studded music festival and conference. (AP Photo/Rogers and Cowan)
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