Fiorenza's musical legacy consists of about thirty traditional hand-written compositions that date from the period between 1726 and 1736. However, it is assumed that during the period he taught at the Conservatory he wrote more works. His surviving works, mostly instrumental, are collected in a manuscript at the Naples Conservatory S. Pietro a Majella: fifteen concertos for different combinations of instruments and nine symphonies, some of which are enlivened by virtuoso solos or wind instruments, which make them comparable to the concerto form.