How I Wrote That Song: Mike Posner "Boyfriend"

Mike Posner hung out backstage to share the story behind how he helped co-write and produce Justin Bieber's hit "Boyfriend" and the different rituals that take place during recording. Subscribe NOW to The Tonight Show Starring Jimmy Fallon: Watch The Tonight Show Starring Jimmy Fallon Weeknights 11:35/10:35c Get more Jimmy Fallon: Follow Jimmy: Like Jimmy: Get more The Tonight Show Starring Jimmy Fallon: Follow The To