Thank you for such a kind comment Li-San. Another feature of the theory books that I feel most proud of is that it’s always evolving and it grows based on a all user feedback. That means that if there’s a topic or worksheet that your classes need and it’s something that will benefit all music teachers in general, just let us know and we’ll write it usually with in 24-48hours. That way you’ll continue getting professional look worksheets and resources without having to do all the preparation and the resource will continue to grow!