Music stops when you leave app

The music quality is great for soothing sleepiness, I just wish it would continue when I leave the app & go to another app without sound like Kindle. Other audio apps are able to do this. I would love to be able to rock my baby to sleep to the music while reading on my phone.

Music tempo is optimized for sleepiness, not for singing along, but its nice to have the lyrics for singing without the music at another time.

msaari about a World of Lullabies - Lullaby your Kids, v3.0