This book is planned for the lover of music, for those who throng the concert and recital halls and the opera - those who have not followed music as a profession, and yet love it as an art; who may not play or sing, and yet are musical. Among these is an. ever-growing number that "wants to know," that no longer  is satisfied simply with allowing music to play upon the senses and the emotions, but wants to understand why it does so.