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INTENSITY
IN musical terminology every gradation of volume in sound, from the faintest to the loudest, enters into the category of Intensity. One of the accepted rules of the arte del bel canto was, that every sustained tone should be coloured by some graduation of intensity. Thus the ability to augment and diminish the volume of tone was so highly esteemed—indeed, so essential—that singers spent much time in acquiring the messa di voce, that is, the steadily graduated emission of tone from the softest degree to the loudest and again to the softest: p
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p. This exercise invariably formed a part of each day’s study, and was practised on several vowels throughout the scale, except the extreme tones, save in rare instances. It was, in fact, indispensable that the singer should be able to colour every tone in three forms of graduated intensity: Soft to loud p