He has written numerous books and invented many listening exercises that tune the ear and increase its perceptive acuity. He is rightly compared with Zoltan Kod�ly and Carl Orff as one of the most important music educators in the 20th century. Once he asked a class of students what music was. Answers flowed, but after writing down 'notes,' 'staff,' 'instruments,' Schafer could restrain himself no longer and asked "Why has nobody said 'Sound?'"