How to play YouTube music videos in background on Android ?

Hi,
How can I play YouTube music videos in the background on Android ? I would like to listen the music while using other apps, but when I switch the app, the music stops. This happen also when I open the new tab in web browser.

You have to check if web browser in your Android phone or tablet supports the playing of music videos in the background.

If you have Chrome:
Settings > Site Settings > Media > Background Play

If you have Samsung Internet:
Settings > Useful Features > Background Play

On Samsung device, you can see the notification:
Keep playing video sound after you leave a tab or Samsung Internet. Some websites don't support Background play.