Songland will kick off its second season on April 13, and it's going to be another star-studded affair. NBC announces the roster of artists for Season 2 today (March 9), but Billboard has them here first.Boyz II Men, Florida Georgia Line, Luis Fonsi, H.E.R., Lady Antebellum, Martina McBride, Julia Michaels, Ben Platt, Bebe Rexha and Usher will appear on this next season of Songland.