That is a question posed by the blogsite FiveThirtyEight. Author Carl Bialik looks at what happened to the Smooth Jazz format when Arbitron’s PPM devices were introduced to markets that carried that format. The results were quick and obvious. Was it disappearing/aging demographics? Format burnout? Or was it the new PPM system of gathering ratings data? Bialik wrote: "smooth jazz is essentially dead on major-market radio. But as to what ...