public void CommonTones_Test()
{
var commonTones = _cMajor.CommonTones(_aMinor);
Assert.Equal(2, commonTones.Count);
Assert.Contains(Pitches.CNatural, commonTones);
Assert.Contains(Pitches.ENatural, commonTones);
Assert.DoesNotContain(Pitches.ANatural, commonTones);
Assert.DoesNotContain(Pitches.GNatural, commonTones);
}