Rachael Findlen(assistant), John Hanes, Sam Holland, Tim Roberts(assistant), Emily Wright, Tucker Bodine(assistant), Aniela Gottwald(assistant), Cory Bice(assistant), Peter Carlsson, Crazy Mike, Eric Eylands(assistant), Tatiana Gottwald(assistant), Justin Fox(assistant), Clint Gibbs, Michael Ilbert, Elliott Lanam(assistant), Angelo Caputo(assistant), Phil Seaford(assistant), Josh Houghkirk(assistant), Damien Lewis(additional), Carlos Oyanedel(additional), Nick Banns, Tatiana Gottwald, Tina Kennedy, Mike Caffrey, Aniela Gottwald, Clint Gibbs(assistant), Cory Bice, Rachael Findlen, Jeremy Lertola, Brian Cruz(assistant), Ryan Shanahan, Dave O’Donnell(horn), Kenta Yonesaka(assistant, horn)

John Hanes(task), Katy Perry, Ryan Shanahan(additional), Joe Zook, John Hanes, Zedd, Tim Roberts(assistant), Sandy Vee, Serban Ghenea, Phil Tan

Zedd, Mike Caffrey(additional, drum machine), Ammo, Oscar Holter, Cirkut, Irene Richter(additional, assistant), Irene Richter(executive), Eren Cannata, Russ Chell, Sean Cook, Justin Tranter, Shellback, Ali Payami, Peter Karlsson(lead vocals), Charlie Puth, Katy Perry, StarGate, Sandy Vee, Butch Walker, Dr. Luke, Max Martin, Greg Wells, benny blanco, benny blanco(additional), Dreamlab