Rumer Karen Carpenter Carpenter Mama Cass Ren Harvieu Justin Hayward Oren Lavie Sophie Milman Rev. Gary Davis Madeleine Peyroux Ae David Foster John Adorney Charlie Winston Bert Kaempfert Asoto Union Rebekah Del Rio Coco Rose Percy Faith Elaine Paige Eleanor Friedberger M People Bobby Bare Jimmy Webb Room Eleven Sara Gazarek Ben L'Oncle Soul Alison Krauss And Union Statio Lena Chamamyan Raz Dwa Trzy Fado Mark Sholtez Ayo Etelvina Maldonado Rob Whitfield Kadhja Bonet Hard Fi Maggie Reilly Petrona Martinez Linda Eder Lea Salonga Brewjam Mary Lou Lord Clay Stuckey Miriam Makeba Dave Berry Kt Tunstall Jake Pearson Jason Robert Brown