     
     /// Modulo 12 representation of `NoteNumber` representation of `Pitch`.
     public var pitchClass: PitchClass { return PitchClass(self) }
+    
+    // MARK: - Initializers
     
     /**
      Create a `Pitch` with a `NoteNumber` value.

        self.frequency = frequency
        self.noteNumber = NoteNumber(frequency: frequency)
    }
}

extension Pitch: Equatable { }

 */
public class Pitch {
    
    // MARK - Type Properties
    
    /// Middle C.
    public static let MiddleC = Pitch(noteNumber: 60)
    
    // MARK: - Instance Properties
    
    /// `NoteNumber` representation of `Pitch`.
    public let noteNumber: NoteNumber
