Why Must Read Accelerated Piano Adventures for the Older Beginner: Theory Book 1?

These are the best books by far to teach with. Amazingly, I actually use the THEORY book for my adults (along with the adult-all-in-one course book) if they have no musical background because it slows down the theory so they can really understand it without feeling overwhelmed. It has really helped them and follows along with the adult book very well.