The book clay whisles the voice of clay by Moniot is printed by Whistle Press. ISBN 0-9524893-0-1 cost was $11.95 last fall. It is an excellent little book giving details for construction of several different types of whistles including how to create chea and durable tools that make the process easier. What a great way to team with another member of the arts force to create sound and visual pleasure. Each whistle should produce a different tone...you could have an band.