Change of pitch is a stumbling block for almost all beginners, and for many experienced speakers also. This is especially true when the words of the speech have been memorized.
In our search for the principles of efficiency we must continually go back to nature. Listen--really listen--to the birds sing. Which of these feathered tribes are most pleasing in their vocal efforts: those whose voices, though sweet, have little or no range, or those that, like the canary, the lark, and the nightingale, not only possess a considerable range but utter their notes in continual variety of combinations? Even a sweet-toned chirp, when reiterated without change, may grow maddening to the enforced listener.
