How do I undo Android Auto when using usb plug in my car?

I plugged into my usb charger in my 2016 Tahoe. Up pops Android Auto on my phone. I clicke something and the next thing I know I can no longer hear my downloaded music via my bluetooth in my car stereo. I can't seem to fix it to undo what I did. Bluetooth is paired with my phone, music not heard via car speaker anymore. Please help.

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