One more native app gets Fluent design aka Project Neon overhaul on Windows 10 Mobile. It is the turn of Groove Music to get the Fluent design elements now.
As you can see in the screenshot above now the hamburger menu is now acrylic instead of earlier Black. You will notice more changes when you will navigate to various menu options.
Even when you move to other sections like Artists, playlist you will see the new design overhaul. The version number for this update is 10.17042.12811.0, same as updated Movies & TV app that also has received Fluent Design on Mobile.
Groove Music on PC has also received this update but without any visible changes as it had already received Fluent Design some days ago.