The baritone and mezzo-soprano voices, so called--that is, such voices as have a limited compass, and cannot sing either the highest or the lowest tones--are by no means so numerous as they are thought to be. The best tenor voices, which cannot naturally reach the lowest bass tones, and whose organs do not allow of an unnatural forcing up beyond the higher limits of the chest register, are commonly pronounced baritone voices, for no one now-a-days thinks of cultivating the falsetto register of the male voice. Few teachers, likewise, understand how to teach correctly the tones of the head register. If a soprano voice cannot readily and agreeably sing the low contralto tones, and extend the falsetto scale far enough upwards beyond its limit, it is reckoned among the mezzo-soprano voices. The celebrated singing master _Thomaselli_, of _Padua_, maintained that baritone and mezzo-soprano voices “had no existence in nature, but were only the products of our false methods of instruction.” I have sometimes found mezzo-soprano and baritone voices, but not in so great number by far as the four chief kinds of voices--bass, tenor, contralto, and soprano. Although an exact knowledge of the vocal organ and its various actions must be required of a teacher before the education of a voice can be committed to him, yet it would be unwise to undertake to teach singing by means of scientific explanations without sufficient previous knowledge; the pupil would, in this case, understand as little of what he was about and be as little helped as a child learning to read would be assisted by one who merely sought to make intelligible to him the mechanism by which sound is formed. The most natural and the simplest way in singing, as in all things else, is the best. Let the teacher sing correctly every tone to his pupil until the latter knows how to imitate it, and his ear has learned how to distinguish the different timbres.[5] The discovery of the natural transitions of the registers has brought to light one of the greatest evils of our present mode of singing, and shown at the same time how wanting in durability are the voices of those of our artists whose aim and endeavor it is to force the registers upward beyond their natural limits. Although the concert pitch is so very much higher now than it was in the most flourishing period of the singing art, yet no regard is paid to this fact in the education of a voice, and our tenorists try to reach the a¹ with the chest register, just as they did one hundred and fifty years ago. In the _ignorance existing concerning the natural transitions of the registers, and in the unnatural forcing of the voice, is found a chief cause of the decline of the art of singing. And the present inability to preserve the voice is the consequence of a method of teaching unnatural, and therefore imposing too great a strain upon the voice._[6]