I don't quite get Kay Kaiser either but as Krin Gabbard points out in "Jammin' at the Margins": " In the early 1940s, Kyser was one of the two or three most popular bandleaders in both record sales and popularity polls, often outdrawing Glenn Miller and Tommy Dorsey, not to mention the black bands." However a paragraph later he adds "But then, perhaps Kyser did not play jazz."