Scuola di canto Italiana

Sometimes Italian School merely refers to beautiful singing in the
belcanto style.

The Italian School ie: OLD Italian school - the Italians first figured
out how to add range to the voice by allowing the larynx to descend as
you ascend in range. Until that discovery people sang with a larynx that
raised (a natural occurrence) which limited their top, and music was
written in a limited range to reflect that fact.