What ever happened to the greats: Jenny Lind, Helen Forrest, Jo Stafford, Annette Hanshaw, Bing Crosby, Fred Astaire just to name a few whose contributions even many of those on the list will (or would if alive) admit to being major influences on their own contributions . . .
There are a ton more missing . . . and as for many of those listed? Their vocal talents are less than adequate !