First turn on Bluetooth and pair it with the car.

1. First, open the music software, the system music playback software that comes with you or the music software that you downloaded.

2. Then, in the music software, find the setting options, click the setting options, and find the background play when closing the software page in the setting options.

3. Then, select the songs you want to listen to and play them. When the songs are played, you can close the pop-up window of the software and automatically play them in the background.

4. Just turn on the stereo, and then play a piece of music. Pay attention to the bar on the right side of the stereo to see if your sound card can be recorded internally.

5. Whether it can be recorded or not is also related to the volume. It is almost the same if the green bar of stereo mixing can be close to the top. Pay attention to turning down the volume of headphones/stereos.

6. Finally, just set the volume of the music again, and you can turn off the software and automatically play it in the background.