This book by R. Murray Schafer is filled with listening and sound making exercises that allow the student to begin thinking more deeply about sounds and their environment. This book will help the participants "clean" their ear and explore questions like the difference between "focused and peripheral listening". Schafer, R. Murray. A Sound Education: 100 Exercises in Listening and Sound Making. Arcana Editions. 1992. PDF accessible at https://monoskop.org/images/7/7b/Schafer_R_Murray_A_Sound_Education_100_Exercises_in_Listening_and_Soundmaking.pdf.
Includes the now commonplace, but at the time new concept, draw and spell that sound