Nicolò Jommelli was one of the documented pupils of Leonardo Leo, who taught at the Sant'Onofrio conservatory in Naples beginning in 1739. Leo, already a leading master of the Neapolitan Baroque and renowned for his command of polyphonic harmony, counted Jommelli among his students, alongside musicians such as Pietro Caffaro, Emanuele Barbella, Niccolò Piccinni, Niccolò Logroscino and V. L. Ciampi.
Through his studies with Leonardo Leo, Jommelli would have been exposed to the rigorous contrapuntal training and stylistic clarity characteristic of Leo’s teaching, which shaped many of the prominent composers of the Neapolitan school in the first half of the eighteenth century.