How to play music youtube in home iphone ios 7?

I can't play music youtube in background of my iphone
So i can do other thing while listen to the music video
When i close the youtube app and press play on my home button its alway play from my music not my youtube app
How can i fix this?
I'm so confused

It's not possible, sorry. But if you do, or consider getting jaikbreak, get a nice tweak called "YouTubed" you can listen to YouTube music in your home screen and while your phone is turned off

It is not possible to do unfortunately, if you want to listen to music try using Soundcloud, it is free to use and has alot of songs. You could also try using a paid music subscription such as Spotify. Hope this helps!

Of course it stops when you exit out of the app. YouTube isn't a music app. It's a video app; it thinks your watching a VIDEO. YouTube is pausing it for you