Tako and Vocalisters
It is not illogical to assume that a castrati's larynx would have about the same size as that of a woman. But the larynx would not have the benefit of growth prompted by the male hormone (testosterone) which regulates the growth and development of primary and secondary male characteristics. Testosterone also was instrumental in determining when growth should stop. It was typical for castrati to be many inches taller than the average man of that time. There are records of chest sizes in the neighborhood of 54 inches in girth. In other words, these men were likely to considered giants for their day.
The capacity of lung space represented by the rib cage size mentioned above would, obviously, be an advantage for any male with a male size larynx. But coupled with a larynx the size of a woman's it would be an enormous advantage. One has only to look at the long coloratura phrases regularly written by composers of this time to realize that they were writing for an extraordinary instrument, be it through training or castration or both.
We know from written records that the castrati had the ability to sing very loudly in comparison to other voices of the time. Even if the trumpet player with whom the noted castrati is supposed to have competed was playing a small bore trumpet, his ability to sing louder and sustain longer and do a more sustained crescendo to forte followed by a decrescendo to niente is pretty substantial proof of these voices being extraordinary.
It is also a blessing that these voices are no longer with us. Think what new pains the "performing practices" crowd could inflict on us with this instrument. No, it is better to have castrati be a part of history and a source of never ending wonder that man could do this to fellow man.
-- Lloyd W. Hanson, DMA Professor of Voice, Pedagogy School of Performing Arts Northern Arizona University Flagstaff, AZ 86011
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