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To be fair shoota, the inclusion of such an important element of the art-form may not have been possible in the time allowed, so maybe as i suggest, a further programme is to be made. i have seen one a few years ago when there was played a recording of the last surviving castrato, and he proved that the reasoning bnehind the practise was sound - the voice is far more resonant and powerful than a standard boy soprano, and obviously career experience simply means that the voice gets better as time goes on, without the worry of it ever breaking and being lost.
Apparaney the worst social aspect of the castrati was their arrested emotional development caused by their castration, which turned into perpetual stroppy teenagers, which together with fame and fortune, made a lethal concoction of superlative artist and petty petulant permanently moody man - nightmare!