Не удается преобразование

        public static WMPLib.WindowsMediaPlayer PRonunciation
        {
            get => pronunciation;
            set => pronunciation = Pronunciation[5]; //ругается на то, что нельзя преобразовать string в WMPLib.WindowsMediaPlayer
        }

        static Dictionary<int, string> Pronunciation = new Dictionary<int, string>()
        {
            { 0, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\acquaintance.mp3")},
            { 1, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\boss.mp3")},
            { 2, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\boy.mp3")},
            { 3, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\chief.mp3")},
            { 4, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\child.mp3")},
            { 5, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\client.mp3")},
            { 6, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\colleague.mp3")},
            { 7, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\competitor.mp3")},
            { 8, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\friend.mp3")},
            { 9, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\girl.mp3")},
            { 10, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\guest.mp3")},
            { 11, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\guy.mp3")},
            { 12, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\man.mp3")},
            { 13, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\neighbor.mp3")},
            { 14, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"engl\people\woman.mp3")},
            { 15, WMP.URL = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"icon\people.mp3")}
        };