Musician John Legend and wife model Chrissy Teigen (left) attend 'The Night That Changed America: A Grammy Salute To The Beatles' in Los Angeles, California, January 27, 2014. — Reuters pic Playlist analysis from music streaming service Spotify has surfaced a new list of most popular wedding music tunes according to its users' preferences. John Legend's "All of Me" is the most popular song across 400,000 Spotify wedding ...