public SettingsPageViewModel(
            IAppSettingsUtility appSettingsUtility,
            IMusicImportService musicImportService,
            ILibraryService libraryService)
        {
            _musicImportService = musicImportService;
            _libraryService     = libraryService;
            AppSettingsUtility  = appSettingsUtility;

            ImportCommand = new DelegateCommand(ImportExecute);
            DeleteCommand = new DelegateCommand(DeleteExecute);
        }
        public SettingsPageViewModel(
            IAppSettingsUtility appSettingsUtility,
            IMusicImportService musicImportService,
            ILibraryService libraryService)
        {
            _musicImportService = musicImportService;
            _libraryService = libraryService;
            AppSettingsUtility = appSettingsUtility;

            ImportCommand = new DelegateCommand(ImportExecute);
            DeleteCommand = new DelegateCommand(DeleteExecute);
        }