The radio ratings formula is a mystery to many, but it really comes down to two factors: cume and TSL (Time Spent Listening). Cume is the total number of listeners. TSL is the number of quarter hours listened. Increasing ratings is as simple as driving more of either or both. A popular strategy for programmers is increasing the occasions of engagement. In that regard, Starbucks is more skilled than many program directors.
Starbucks Teaches Programmers How To Increase Ratings