I read that and Im not sure exactly how to do the referencing project thing but I will post the list And alot of these singers sing in whistle very well my favorites are Toya Alexis Shoshana Bean Tamar Braxton Tisha Campbell Blu Cantrell Mariah Kelly Clarkson Terry Ellis Lisa Fischer Nina Girado Vivian Green Jennifer Hudson JoJo Lani Misalucha and Shanice