Android phones, apps and tablets

You can install the Google music manager on your desktop and it syncs any folders you point it at automatically in the background.

Fine if you want your whole collection on your phone, or if you just want specific albums or playlists. Overall it is fine, but I have gone of 'Google Music'. The sync is over wifi, but the data is sourced from your cloud account as opposed to your local computer.

You can also just use Android File Transfer for OS X to transfer music on to your phone.

This is painful, only good if you ware dealing with albums or subsets of a large collection.

My solution is to use Spotify to manage my music. I want specific albums and am a big playlist junkie. So for me this is the best solution, also the syncing is from your computer to your phone via wifi.