Peter Pan | Peter Gabriel | Peter Jackson | Peter | Saint Peter | Peter Paul Rubens | Peter Sellers | Peter the Great | Blue Peter | Peter Frampton | Peter Greenaway | Peter Brook | Peter Lorre | Peter Ustinov | St. Peter's Basilica | Peter Kropotkin | St. Peter | Peter Fonda | Peter Kay | Peter David | Peter Mandelson | Peter O'Toole | Peter Allen | Lord Peter Wimsey | Peter Sellars | Peter Schreier | Peter, Paul and Mary | Peter Davison | Peter Singer | Peter Maxwell Davies |
Hayes and Mraz invited YouTube artists and other aspiring musicians Tessa Violet, Echosmith, TJ Smith, Tyler Ward, Brandyn Burnette, Brian Landau, Sam Tsui, Kina Grannis and Peter Hollens to share their covers of the song, and participate in a one-take mashup video.