By directing the attention of one's pupils to these different sensations, it is very easy to make them acquainted with the different registers of the voice--always a very necessary proceeding in the first training of a voice, although it seems to be so only in the case of such voices as have been previously misdirected.
The culture of the female voice is best begun with the two series of the falsetto register and the second of the chest register; the tones of these three middle registers must be pretty well cultivated before the lowest chest tones and the head voice are begun to be formed. The voice in this way best attains to an equal fulness. It is self-evident also that the teaching should be such that the transitions of the registers should be not at all or scarcely perceptible, consequently that all the tones should sound proportionally strong and full.
In the soprano voice the falsetto, and in the contralto voice the chest register, have more fulness and grace, and thus we may distinguish to which kind of voice a voice belongs, for the compass of the voice is not always confined within certain limits. There are contraltos that can sing the high head tones with ease, and sopranos that can sing the low chest tones with equal facility--a fact which has often given occasion to an incorrect treatment of a voice. So also with the male voice. A bass voice sings the lower series of the chest register with more ease and sweetness and with more obscure timbre. A tenor voice sings the second series of the chest register in a clearer timbre.
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.”