For us who love having Google Music put all our music on the cloud, but hate the fact that it is got to be one of the worst music players, we have this.
Takes all your offline music, puts it into your folder of choice, all tags and cover art intact for playing in any music app you want. It's not free, but under $3. Just got it today, and works pretty good. Not only does it make you offline music playable by whatever else, it will automatically delete the google music cache, so you are not storing things twice.
https://play.google.com/store/apps/details?id=com.t3hh4xx0r.cloudsniper&hl=en
Takes all your offline music, puts it into your folder of choice, all tags and cover art intact for playing in any music app you want. It's not free, but under $3. Just got it today, and works pretty good. Not only does it make you offline music playable by whatever else, it will automatically delete the google music cache, so you are not storing things twice.
https://play.google.com/store/apps/details?id=com.t3hh4xx0r.cloudsniper&hl=en