A Great Big World Pentatonix The Passengers Adam Levine Adele Adkins Pitch Perfect Phil Phillips Gabrielle Alpin American Mouth Lucy Spraggan The Walkervilles Sleeping At Last Passenger American Authors Farewell Drifters Kodaline Imagine Dragons Ingrid Michaelson Eli Lieb Bastille Steve Grand Sara Bareilles Picture This The Fray X Ambassadors Maroon 5 Tom Odell All Time Low Mumford & Sons Katy Perry Panic! At The Disco Relient K Little Hours Coldplay Keywest Emeli Sande Dala Daughter Lewis Watson Lorde A Fine Frenzy Original Broadway Cast Of Hamilton Ron Pope Shepperd Noah Kahan Declan J Donovan Serena Ryder Todrick Hall Mike Tompkins