No in-game music - MCPE 1.1.5 on iOS

The wonderful in-game Minecraft soundtrack doesn't work on my iPad. I have tried the following to attempt to fix it:

• reinstall the game and restore my game save
• resintall the game and start a new game
• playing around with the music volume setting (100%, 97%) to see if that would get around the bug

I can't listen to the MC soundtrack, and I'd love to be able to.