private IFixtureStepRunner RunnerOf(NoteStep step) => new NoteStepRunner(step);
public Pitch(NoteStep step, string octove) { Step = step; Octove = octove; }
public Pitch(NoteStep step, NoteAccidental accidental, string octove) { Step = step; Octove = octove; }
public Pitch(NoteStep step) { Step = step; Octove = string.Empty; }