You can stream audio (sound) via Bluetooth: Take control of Spotify, Tune In, phone music library or any radio station app using iDrive.
You can also view the album covers on your car screen and phone contact pictures.
As a bonus, you can view the messages from your mobile on the car screen display by selecting 'Office' menu and by allowing notifications on your mobile phone. Incoming message will be visible in notifications menu. You can read it or listen to it.