No sound thru Bluetooth in Car.

[user-removed]

I specifically reinstalled Spotify on my android phone so I could connect to the Bluetooth in my new car. I tried it today for the first time -- and the Spotify ad played just fine thru my car speakers, but then the music had no sound. I could see it playing on my phone -- but no sound thru the car speakers. Tried a different song with the same result. Help??