In the music app, just turn on the switch that allows simultaneous playback with other apps.

Here is QQ Music as an example: Open QQ Music. Click My in the lower right corner and click the three icons in the upper right corner. Click Settings on the page to jump to. Swipe the page, click the switch button after allowing simultaneous playback with other applications, and select to turn it on.

Douyin is a short video sharing software launched by ByteDance. It was launched in September 2016. It is a music short video community platform for all ages.