Provided to YouTube by Columbia Roar (Glee Cast Version) · Glee Cast · Demi Lovato · Adam Lambert A Katy or a Gaga (Music from the Episode) ℗ 2013 Twentieth Century Fox Film Corporation Released on: 2013-11-05 Associated Performer: Glee Cast feat. Demi Lovato & Adam Lambert Composer, Lyricist: Katy Perry Associated Performer, Producer: Adam Anders Composer, Lyricist: Bonnie McKee Associated Performer, Producer, Recording Engineer: Peer Astrom Composer, Lyricist: Henry Walter Producer: Ryan Murphy Composer, Lyricist: Max Martin Recording Engineer: Alex Anders Assistant Engineer: Fredrik Jansson Composer, Lyricist: Łukasz Gottwald Assistant Engineer: Joshua Blanchard Assistant Engineer: Ryan Gillmor Mixing Engineer: Henrik Edenhed Mastering Engineer: Dominick Maita Auto-generated by YouTube.