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LOS ANGELES, CA - FEBRUARY 08: Rapper Common (L) and singer John Legend perform 'Glory' onstage during The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

LOS ANGELES, CA - FEBRUARY 08:  Rapper Common (L) and singer John Legend perform 'Glory' onstage during The 57th Annual GRAMMY Awards at the at the STAPLES Center on February 8, 2015 in Los Angeles, California.  (Photo by Kevork Djansezian/Getty Images)