This upbeat jam finds Katy promising to give some lucky person the best birthday ever. The exuberant track was written by the singer in collaboration with Bonnie McKee, Henry Walter, Max Martin and Dr. Luke. The same team also penned Prism's lead single, "Roar."
Katy sings some of the song in a Mariah Carey-esque higher register. "I wanted to do something that Mariah Carey would have put on her first record," Perry said while introducing the song during Prism's listening party.
The song's live brass is provided by the Saturday Night Live house band horn section, which gives us another Mariah Carey connection. The multi-octave songstress employed this same horn section for her performance of "If It's Over" during her 1992 MTV Unplugged special.
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