Microsoft has revealed that it is shutting down its Groove Music for iOS and Android this year. The apps will be shut down from the 31st of December 2018.
The company has said that your music files will still be available in OneDrive after this date, you can see more details on what is happening below.
On December 1, 2018, the Groove Music iOS and Android apps will be retired. Your personal music files will continue to be available in OneDrive. You can keep listening to those files, and your playlists, with the Windows 10 Groove Music apps on PC, Xbox, or Windows Phone.
Your personal music files will still be available on OneDrive. You can access OneDrive online or through the OneDrive app on any supported device. To keep playing your music and playlists in Groove, use the Windows 10 Groove Music apps on PC, Xbox, or Windows Phone.
You can find out full information on what is happening to Groove Music over at Microsoft at the link below.
Source Microsoft