Here's how you can limit Google Music's data usage on your Android device.
1. Go to Settings.
2. Go to the Streaming menu.
3. Go to Mobile Networks Streaming Quality.
4. You can choose from Low, Normal and High. The lower the setting, the less data Google Music will use.
So chose your setting carefully in Google Music, otherwise you might end up having to pay a higher cellular data bill for your Android device.
Read more: CNet