Music integration is a PRO version feature that allows automatic creation of Music playlists corresponding to specific download tags: 
With this option enabled for a specific tag, all media downloads marked with this tag will automatically appear in your Music library, and a playlist named after the tag will be created. (The exception is the music tag, for which the files will appear under the playlist named Downloaded Music.)
With this option enabled for a specific tag, all media downloads marked with this tag will automatically appear in your Music library, and a playlist named after the tag will be created. (The exception is the music tag, for which the files will appear under the playlist named Downloaded Music.)Note: Music integration works only for files supported by Music. Files or unsupported formats (for instance, .mkv) will not be added to your Music library, even if marked with a tag for which integration is enabled.