C# Console Song

Song.Play(Song.Mary);
public static class Song
    {
      public static Note[] Mary =
       {
        new Note(Tone.B, Duration.QUARTER),
        new Note(Tone.A, Duration.QUARTER),
        new Note(Tone.C, Duration.QUARTER),
        new Note(Tone.A, Duration.QUARTER),
        new Note(Tone.B, Duration.QUARTER),
        new Note(Tone.B, Duration.QUARTER),
        new Note(Tone.B, Duration.HALF),
        new Note(Tone.A, Duration.QUARTER),
        new Note(Tone.A, Duration.QUARTER),
        new Note(Tone.A, Duration.HALF),
        new Note(Tone.B, Duration.QUARTER),
        new Note(Tone.D, Duration.QUARTER),
        new Note(Tone.D, Duration.HALF)
        };
      public static void Play(Note[] tune)
      {
        foreach (Note n in tune)
        {
          if (n.NoteTone == Tone.REST)
            Thread.Sleep((int)n.NoteDuration);
          else
          {
            Console.Beep((int)n.NoteTone, (int)n.NoteDuration);
            Console.WriteLine(n);
          }
        }
      }

      // Define the frequencies of notes in an octave, as well as
      // silence (rest).
      public enum Tone
      {
        REST = 0,
        GbelowC = 196,
        A = 220,
        Asharp = 233,
        B = 247,
        C = 262,
        Csharp = 277,
        D = 294,
        Dsharp = 311,
        E = 330,
        F = 349,
        Fsharp = 370,
        G = 392,
        Gsharp = 415,
      }

      // Define the duration of a note in units of milliseconds.
      public enum Duration
      {
        WHOLE = 1600,
        HALF = WHOLE >> 1,
        QUARTER = HALF >> 1,
        EIGHTH = QUARTER >> 1,
        SIXTEENTH = EIGHTH >> 1,
      }

      // Define a note as a frequency (tone) and the amount of
      // time (duration) the note plays.
      public struct Note
      {
        Tone toneVal;
        Duration durVal;

        // Define a constructor to create a specific note.
        public Note(Tone frequency, Duration time)
        {
          toneVal = frequency;
          durVal = time;
        }

        // Define properties to return the note's tone and duration.
        public Tone NoteTone { get { return toneVal; } }
        public Duration NoteDuration { get { return durVal; } }
        public override string ToString()
        {
          return $"Tone: {toneVal} Durration: {durVal}";
        }
      }
    }