It probably has something to do with the fact that traditional radio is viewed as more of a promotional tool to drive record sales than a revenue stream. http:

It probably has something to do with the fact that traditional radio is viewed as more of a promotional tool to drive record sales than a revenue stream. http://en.wikipedia.org/wiki/Payola http://en.wikipedia.org/wiki/Payola Enter Pandora which even though it has radio in the name is different in that the user has a greater degree of control. So Where as artist were accepting that they didn't make much off traditional radio and viewed getting play time as good publicity they probably don't view Pandora and services like that in the same light. In fact they might even view them as cutting into Record and digital download sales.