This work lays before those who sing or who are about to study singing, the simple, fundamental rules of the art based on common sense. The two greatest living exponents of the art of singing, Enrico Caruso and Luisa Tetrazzini, were chosen as examples, and their talks on singing have additional weight from the fact that what they have to say was printed exactly as it was uttered, the truths they expound are driven home forcefully, and what they relate so simply was backed by years of experience and emphasize by the results they achieved as the two greatest artists in the world.