ISBN 9781609744656. This book has been designed to develop the professional or recreational accordionist further toward advanced musicianship. Why do we practice scales? The great jazz accordionist, Art Van Damme, when asked what he practiced, replied, "Only the fundamentals!" The fundamental classical and jazz scales with explanations are presented here in a clear, concise format. For best results use this book with or after the Chord Melody Method for Accordion.