Boot Scooter: Music executive and talent manager Scooter Braun has joined Cumulus' artist development competition Nash Next as a guest judge for the Periscope Live Broadcast Challenge Sept. 14-23. The third round challenge features contestants performing orginal songs live on Periscope. Braun founded SB Projects and was instrumental in the careers of Justin Bieber, Ariana Grande, Dan + Shay and Carly Rae Jepsen. More here.