Help find a device to play music for a Down's syndrome child

Here's the challenge, she enjoys listening to music (with headphones on), but unfortunately gets frustrated when things don't go her way, and can get. physical very fast. (Picture a tablet being zoomed across the room hitting one of her 3 siblings.)

Therefore, trying to select a device that pretty much does ONLY music so that she's not tempted to try to execute other functions that will frustrate her.

I know it sounds simplistic, and maybe even cruel, but we're just trying to help a family in need, and this is what they're asking for.

An old iPod-like device would be perfect, but obviously need it to work with today's technology to get music on it.

Thanks!