A sopranist is a male singer who sings in the soprano vocal range; a countertenor who sings higher than the typical alto range.
There is a large body of music for male soprano written when it was common to use a castrato - a voice type which, for all intents and purposes, no longer exists. Sopranists are very rare, since most countertenors are altos.
Since Max can sing from a middle C to high A, he is considered a sopranist.
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