If you want to listen to tunes on your Android phone, you'll know that the official YouTube app doesn't allow you to play YouTube videos in the background. There are a few ways to get around this restriction, and the easiest is by using your mobile browsers. We'll show you how with Firefox and Chrome!
https://www.maketecheasier.com/play-youtube-videos-in-background-android/
* downloading some apps that take care of it * Screen shot of YouTube