The first exercise in this book was used by Claude Gordon to introduce K Tongue Modified tonguing. The exercises that follow are from moderate to advanced level flexibility studies. The end of the book contains various awkward phrases Claude experienced of his career. These phrases are to be played chromatically in all keys and used similar to the material in Claude's Thirty Velocity Studies book.
Currently the Bass Clef edition is out of print. However, we are able to maintain a limited stock of this book.