The Shotgunner is responsible for controlling music selection and volume and he is expected to be conscientious of the other riders preferences. Just as the driver may not institute a Shotgun Dictatorship, the Shotgunner may not exercise a music dictatorship.
Remember, just like in any great movie, you are setting the tunes for how your trip will be remembered. Will it be Mozart, Tool, Paramore, a Michael Bay instrumental or a Pharrell Williams “Happy” jam?
4.6.1 For your own safety and the safety of those in the car with you, music preferences of the Driver trumps all other music requests.