You're at a social gathering.
You're desperate to impress the assembly with that new little-known artist whose latest EP isn't even on Spotify yet.
You want to play the track via YouTube, but you know the moment the app closes the song will stop playing. You'll be ostracised, kicked to the curb with nothing but your niche tastes for comfort.
Never fear - this is how to play music from the YouTube app and keep using the rest of your phone.