Pictures 2015 GRAMMY Performers February 6, 2015 / 10:07 AM CST / CBS News 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers