How do I set the Google Music Play app to store the local "offline" music on the SD Card? I've used up about 90% of my internal storage.
I've looked in the app Settings and don't see any options for that.
If your phone is rooted you can solve this via a shell command:
(Replace [Path to new Location] with a Folder on your external SD-Card)
It will basically redirect every access to the default folder to the Folder which is specified.
You probably need to do this every time you reboot your Phone, so you may be interested in putting a script which does that into Autostart.
I found that I was just able to use a couple of sym-links to solve this problem. All you need is a rooted device. I've written up a simple guide here:
However as requested, here is a summary for posterity: