Billie Holiday, Edith Piaf, Ethel Waters, Mabel Mercer, Conrad Salinger

Whitney Houston, Mariah Carey, Céline Dion, Alicia Keys, Adele, Jennifer Lopez, Luther Vandross, Ricky Martin, José José, Kelly Clarkson, Lionel Richie, Regine Velasquez, LeAnn Rimes, Lea Salonga, Siti Nurhaliza, Lani Misalucha, Zola Jesus, Tina Arena, Carola, Sheena Easton, Sissel, Sertab Erener, Shoshana Bean, Vina Panduwinata, Dina Carroll, Joi Cardwell, France Joli, Linda Eder, Nancy Lamott, Ryan Molloy, Wendy Matthews, Nina Badrić, Idina Menzel, Maureen McGovern, Petra Berger, Ann Richards, Jeanette Jurado, Cay, Heather Eatman, Tessanne Chin, Jan Werner Danielsen, Josie Aiello, Jacintha, Margareta Pâslaru, Arnel Pineda, Paloma San Basilio, Lea Michele, Laura Jansen, Kerry Ellis, Vicki Vann