Groove Music

Microsoft has started to roll out an update for the Groove Music player app on Windows 10 with a single usable feature — Mini-View. The update is available to the public on Windows 10 Creators Update (OS Build 15063.483 and above) and lets users switch to a mini player in a compact overlay or a Picture-in-Picture mode.

The mini-view stays on top of all other open windows which will let you multitask efficiently with one click access to Now playing including the ability to pause, seek, jump to next or previous track.
Groove Music Mini View

The same functionality can be seen in Movies & TV app which lets you enjoy movies and TV shows without interrupting your workflow.

Build 10.17062.14111.0 of Groove Music is now available in the Windows Store and you can grab it from the link below.

Windows Media Player
Windows Media Player