Diane Birch Deb Talan Judie Tzuke The Disciplines Portland Cello Project N.A.S.A. Visqueen Two Bears Chubby Checker Holly Brook Amy Lavere Nina Gordon Monte Montgomery Joss Stone Swandive Raphael Gualazzi Pricilla Ahn Alice Russell Melody Gardot Abandonspree Koyote Alele Diane Alessi'S Ark Jorane Haley Laura Doggett John The Conqueror Nashville Cast Violet Archers Marc Broussard Edith Piaf Andra Day Secret Garden Serena Ryder Duffy The Burning Hell The Lone Bellow Shelby Lynne Rachael Yamagata Sara Bareilles Jonatha Brooke Cold Weather Company Paolo Conte Pink Martini Norah Jones Kt Tunstall Raveena Emmylou Harris Kate Nash