The coaches for The Voice got together for a campfire singalong in a new promo for the show’s upcoming 21st season. Blake Shelton, Kelly Clarkson and John Legend welcome new coach Ariana Grande, who as the newest member has to lead the group in a tune, according to tradition.  She’s in good voice for a rendition of Olivia Newton-John‘s Hopelessy Devoted To You, a hit on the country charts in 1978. The new season of the show premieres on September 20.