What is Music on macOS?

/System/Library/Frameworks/QuickLookUI.framework/Versions/A/PlugIns/Music.qldisplay/Contents/MacOS/Music

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/System/Applications/Music.app/Contents/MacOS/Music

Media player application developed by Apple Inc

Provides a listening experience that allows users to organize and listen to music, explore new genres, and follow all the latest trends. With the Music App, you can access all your music from Apple Music, iTunes Store, and the iCloud Music Library.