I downloaded google play music from playstore. I then deleted it to free up some space believing that I could download it again for free but when I go back to playstore to download again there is no facility to do that - only 'listen' or 'subscribe'. I can download and pay for new tunes but cannot download the tunes I've already paid for. I get the message "waiting for music to sync" then "your music is currently being added - please wait a moment and try again". I'm trying to download it again onto the same phone not another device. What am I doing wrong??