You can also remove this default app or disable it completely by performing a two-click operation, i.e., right-clicking an app in the All Apps list in the Start menu ...

It is now available to Windows 10 users in the Release Preview Channel ... The Windows Media Player substitutes the old and abandoned Groove Music app. It features a more modern user interface ...

In case, you have music files stored on an external device like USB flash drive or an external hard drive, you can add music from a USB flash drive or external hard drive directly to the library.