public void Index_Test()
{
Assert.Equal(0, Notes.C.Index);
Assert.Equal(1, Notes.D.Index);
Assert.Equal(2, Notes.E.Index);
Assert.Equal(3, Notes.F.Index);
Assert.Equal(4, Notes.G.Index);
Assert.Equal(5, Notes.A.Index);
Assert.Equal(6, Notes.B.Index);
}