Re: how do i save my google play music to sd card
Welcome to Android Central! You can't. The music that is downloaded directly from the Play Music apps stored in an obscure directory, with coded filenames. Downloading music from the Play Music app is really only intended for offline listening, not for file transferring or manipulation. On some devices, there is a setting in Google Play Music that allows you to temporarily download music directly to the SD card, but if you don't see that setting, then it's not possible on your device.
The next best thing is to download the music from your Google Play Music library website on your computer, then transfer those mp3 files to the phone's SD card. I recommend creating the usual folder hierarcy of Artist>Album>Song.