FILE - This May 6, 2013 file photo shows Rihanna performing in 

FILE - This May 6, 2013 file photo shows Rihanna performing in concert in Boston. It's a crowded tour market and everyone is competing for your entertainment dollar. Rihanna and Beyonce are both touring separately. (Photo by Bizuayehu Tesfaye/Invision/AP, file)
Associated Press
FILE - This May 6, 2013 file photo shows Rihanna performing in concert in Boston. It's a crowded tour market and everyone is competing for your entertainment dollar. Rihanna and Beyonce are both touring separately. (Photo by Bizuayehu Tesfaye/Invision/AP, file)
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