Bieber took video notes and posted the performance on Instagram
Fox also announces Randy Jackson is returning in the role of mentor
After several botched negotiations with other candidates, the crooner joins Season 13
Opinion: The Fox competition strangely has passed over both alums in its drawn-out search, though both have expressed interest in joining the panel
The music superstar also announced plans to take his career to the "#nextLEVEL" by shooting "a music video in SPACE!"
The singer will executive produce and star in the series about his awkward teenage years
Grammy board "blew it" by not including Justin Bieber among trophy hopefuls, Scooter Braun claims