John Legend, Ed Sheeran Join U.N. to Create 'World's Happiest Playlist'

John Legend and Ed Sheeran have joined forces with the United Nations to create "the world's happiest playlist" to celebrate International Day of Happiness. In partnership with music streaming service MixRadio, the U.N. has enlisted a roster of artists, including David Guetta, James Blunt, Cody Simpson and Charlize Theron, to launch its...