Google Music
From Indie IT Wiki
Add your music with Google Play Music Manager
https://support.google.com/googleplaymusic/answer/1075570
Download Google Play Music Manager
Google Play Music Manager for Debian Linux 64-bit
Download Purchased Music
- Go to: https://play.google.com/music/listen#/albums
- Hover the mouse over the album title to reveal the 3-dots icons button (TDIB)
- Click on the TDIB and select "Download album" from the menu