How do I merge all music from all devices
i have several Apple devices and they all have different music on them. I would like to have one library - the same on all devices
Are all the devices associated with the same Apple ID?
If so you you can d/l all you iTunes purchases to the devices.
If you sync to a computer then sync all the devices back to the same computer - select the apps/tunes et you want on the device and sync from the computer back to the devices using the same settings for the content to each device.
MJ