Birthday

Credits

• Alex Foster
  alto saxophone
• Cirkut
  instrument, producer, programming
• Clint Gibbs
  engineer
• Cory Bice
  assistant
• Dave O’Donnell
  horn
• Dr. Luke
  instrument, producer
• Earl Gardner
  trumpet
• Elliott Lanam
  assistant
• Eric Eylands
  assistant
• Irene Richter
  additional, assistant
• John Hanes
  engineer
• Katy Perry
  vocal
• Kenta Yonesaka
  assistant, horn
• Lenny Pickett
  horn, tenor saxophone
• Max Martin
  instrument, producer
• Michael Ilbert
  engineer
• Peter Carlsson
  engineer
• Ron Blake
  baritone saxophone
• Sam Holland
  engineer
• Serban Ghenea
  mix
• Steve Turre
  trombone
• Steven Wolf
  additional, drums (drum set)
• The Saturday Night Live Band
  performer