Art of Breathing as the Basis of Tone-Production - Paperbackby Leo Kofler (Author) The Art of Breathing as the Basis of Tone Production by Leo Kofler is a comprehensive guide for musicians and singers who want to improve their tone production. The book focuses on the importance of proper breathing techniques in creating a beautiful and powerful sound. Kofler provides detailed instructions on how to breathe correctly and how to use breath control to enhance tone quality. He also covers topics such as posture,