Update to Google Play Music allows users more control over sound quality
Download Quality has three choices which are "High," "Normal," and "Low." By default, Download Quality is set on "Normal." If you set the quality to high, you will be consuming more of your native storage when downloading a song. To change your settings, go to the hamburger menu in the upper left of the Google Play Music app and click on, well, settings.
The update for Android carries software version 7.5.4518 and is in the process of rolling out right now. To expedite the process, open the Google Play Store app and tap on the hamburger menu on the upper left. Click on My apps & games, scroll to Google Play Music and tap on update. That's all there is to it. If you don't see it yet, it means that the update has not yet hit your handset.
To install Google Play Music, click on the appropriate link (Android|iOS)