"Search for Ah...is easy to follow. It works both as an explanation of tuning systems with their resultant 'families of pitches' and as an engaging adventure story set on a beautiful island. You will find it enjoyable reading and a valuable education. It is a revolutionary look at the science and aesthetics of tuning systems."
Terry A. Setter, Senior Music Faculty, The Evergreen State College
"Search of Ah...creatively provides today's educators with important science concepts blended with a strong literary connection."
Aly Evans, Director of Education Programs, Reuben H. Fleet Science Center
Mark and Joe have "created an enchanting, magical journey. [They remind] us that music and mathematics were once a spiritual endeavor---and that they could be again. This highly original work will inspire a great many people. Read with care: this could change your view of music forever."
Larry Dossey, MD, author of Healing Words, Meaning and Medicine, Recovering the Soul, Reinventing Medicine