If we glance back into history we find that at one time listening was the principal procedure by which a man acquired his education and expanded his own intellectual background. Some of the world's greatest teachers-Homer, Socrates, Christ, and Mohammed-employed speech and listening more extensively and more effectively in their teaching than they used writing and reading (9). As Tennyson reminds us in Passing of Arthur, The old order changeth, yielding place to new. So with the invention of the printing press in the days of the Reformation, listening slowly gave precedence to reading and the printed page. art of listening and the culture of oral tradition were largely supplanted by a concern for the printed page and by the practice of measuring literacy in terms of reading. Hence, for more than three centuries the Occidental World became increasingly conscious of print, and the major responsibility of acquiring an education was imposed on the eye. Now, in less than twenty-five years, the radio and the sound motion picture have restored the ear to its former pre-eminence (1). These innovations, together with the ease with which we assemble today, have increased the use and importance of communication through the ear.