Usually when playing downloaded videos from Yourtube, you have to stay in the app to watch the video or listen to the music. When the app closes, backgrounded or not, the video stops playing. I accidentially found a workaround for this though.. Load up a video. Hold the rewind button until you return to the video select screen Background youtube and you're done. The audio will play in the background, and as long as youtube is running it will continue playing. I havn't seen or heard of this anywhere, so apologies if its been mentioned, I just wanted to share my finding.