I guess that on the current gout of 'classic/oldies' stations there's no real motivation for Payola:
https://en.wikipedia.org/wiki/Payola
Apart from Classic-FM in the car [they have a playlist of 300 so at lest there's some variety] these days I find digital-streaming stations to be the thing to go for.
www.di.fm is my default go-to - but not everyone's going to be into vocal trance or chillout.