I think it's going to be Valerie Pettiford from the hit Broadway musical 'Fosse' because she has a very good manner and brilliant singing voice. She's in the style of Broadway jazz singer and I think it will be the best that she could sing very well indeed.
Try Jack Donahue. He's got two albums out and he does classic Broadway (Cole Porter, Rodegers and Hart), contemporary theatre (Adam Guettel) and jazz. Jack Donahue