You already could play a lot of YouTube videos with the screen off, or with the YouTube app in the background. This app would come in handy for the music videos which Google apparently is not allowed to play in the background.
How can you do that (without rooting)? I developed this app because I could not find any to turn off the screen while keeping youtube playing without rooting.
One of the selling points of Google's Play music is letting you play videos in the background (part of YouTube Music Key).
You are right, but also I didn't want to pay :P
Another alternative is YT Mobile for background YouTube play: http://ytmobile.tk/
Thanks for the suggestion mate. However, I don't like installing apps from unknown sources, and I also wanted to use YouTube stock app, that's why I ended up developing this app ;)
Does this follow Youtube's TOS ?
I would not be too surprised to see it removed from the store.