Entertainment 2015 GRAMMY Performers February 6, 2015 / 8:01 AM PST / CBS News 2015 GRAMMY Performers 2015 GRAMMY Performers 2015 GRAMMY Performers (credit: Kevin Winter/Getty Images for CBS Radio Inc.) 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