Play only audio from video, with the screen off?

[Windows Central Question]

I'm considering getting a Lumia 640 after five years of using an iPhone, was wondering if it's possible to play video in the background and just listen to the audio? Both when in other apps and with the screen locked? I do this often with YouTube talkshows.

 

[Martsicky]

I'm considering getting a Lumia 640 after five years of using an iPhone, was wondering if it's possible to play video in the background and just listen to the audio? Both when in other apps and with the screen locked? I do this often with YouTube talkshows.

you can listen to music from mobile youtube website with screen turned off, but to play audio only in background while using other apps you need an unofficial quality youtube app such as myTube (trial/0.99$) or Metrotube (fully functional trial/0.99$).