LOS ANGELES, CA - FEBRUARY 06: Musician Cliff Williams of AC/DC attends the GRAMMY Charities Signings during The 57th Annual GRAMMY Awards at the Staples Center on February 6, 2015 in Los Angeles, California. (Photo by Maury Phillips/WireImage)
LOS ANGELES, CA - FEBRUARY 06: Musician Cliff Williams of AC/DC attends the GRAMMY Charities Signings during The 57th Annual GRAMMY Awards at the Staples Center on February 6, 2015 in Los Angeles, California. (Photo by Maury Phillips/WireImage)