This is an app I have written for Android devices. It can play thousands of live internet radio stations from all over the world and is designed for use within a car.
https://www.youtube.com/watch?v=ywZ1q75rrZA
The app can be installed on a phone and the phone can then be connected via bluetooth to an existing car stereo.
The app is voice controlled, allowing ease of use whilst driving. Radio stations can be searched for and stored in presets for future use.
This app utilizes the Radiotime API for initial searches.
Android Car Radio