"The Night That Changed America: A GRAMMY Salute To The Beatles" - Backstage And Audience
LOS ANGELES, CA - JANUARY 27: Musicians Katy Perry and John Mayer attend "The Night That Changed America: A GRAMMY Salute To The Beatles" at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Lester Cohen/WireImage)