 
 extension Chord: CustomStringConvertible {
 
+  /// Converts `Chord` to string with its key and type.
   public var description: String {
     return "\(key)\(type)"
   }


/// Chord object with its type and key.
public struct Chord {
  public var type: ChordType
  public var key: NoteType

  /// Initilizes the chord with type and key.

  /// Eighth note.
  case eighth
  /// Sixteenth note.
  case sixteenth
  /// Thirtysecond note.
  case thirtysecond
  /// Sixtyfourth note.
