How to save Apple Music on My Android Phone Since I Want to Cancel Subscription?

[AC Question]

I became a Apple Music subscriber since the company developed the Apple Music app for android users. However, I 'm recently considering switching from Apple Music to Spotify. But before that, I have to deal with my paid Apple Music stream tracks. I know that these songs will no longer be playable if I unsubscribe to Apple Music.

Anyone can give me some suggestions? How can I transfer these Apple Music songs to MP3 files?