Remember the iPod? Discman? Walkman? People who want an audio-only device have a few options, such as the Mighty or the Yoto. Or you can take an older iPhone or iPad and only allow music apps. If you have an existing digital music library, you can load it onto the device since the storage is not used for other applications. If you want to take it on a run or drive, most music apps allow you to download it for offline listening, so there’s no need to pay for mobile service. If it’s for kids, add headphones if you don’t want to hear their music and make sure you’ve turned on any parental controls in the services. (Yes, even music and audiobook apps have inappropriate content.)