David Ryan Harris Ernie Halter Colby Calliat Cameron Mitchell Brian Mcfadden Melanie Fiona Pj Morton Ryan Chance Bob Evans Shane Filan Roberta Flack Laura Shigihara Kian Egan Ernie Smith Eric Hutchinson Vusi Mahlasela Dave Barnes Bobby Brown Shanice Mindy Gledhill Matt White Deniece Williams Doozy Riley Smith Minnie Riperton Sister Hazel Justin Nozuka Devin The Dude Waking Ashland Adventure Time Patrice Rushen Lesse Michael Tolcher Tori Kelly Salt N Pepa John Legend En Vogue Jj Heller Graham Colton Matt Wertz Allen Stone Jason Mraz Jon Mclaughlin Clay Walker Jimmy Needham Ben Rector John Mayer Brett Young David Crowder Band