Every wonder why so many radio stations play the same music? This article from Nielsen--the biggest measurer of radio ratings in the US--explains it. It's all about chasing ratings. (Thanks to Bridget for the link.)
Which group of radio listeners is most influential when it comes to radio ratings?
For radio programmers, the questions don’t get much bigger. Intuitively, it would seem like the power listeners would fit the bill, given their extensive exposure during a typical week. Surprisingly, however, Nielsen research shows that there’s more influence in the middle of the road than at the extremes, and those findings hold true across portable people meter (PPM) and diary listeners.
To arrive at these findings for PPM listeners, Nielsen broke down some behind-the-scenes data and examined raw listening numbers for the broad spectrum of listener types aged 25 to 54. When we plotted the findings across a traditional two-axis graph, we found that the ratings impact was far greater among the group of listeners who are using the station in moderate levels each week, but aren’t necessarily super-users.