I was laughing about this the other day while checking email and listening to what plays on your typical classic rock station. In the space of an hour, we heard REO Speedwagon, Lynyrd Skynyrd, Clapton, George Thoroughgood.
So, yeah, shocking that your typical "rock" fan isn't a Democrat. Shocking. Your typical American "rock" fan (i.e., someone who freely chooses to listen to the typical "classic rock" station) is Alan Partridge with better teeth. At the very least, that seems to be so for whoever is responsible for programming.