The majority of Reggio’s original works are held in the Santini Collection in the Diözensanbibliothek, Münster. It is possible that Santini acquired Reggio’s library on Reggio’s death. These consist of sixteen manuscripts comprising some 180 individual works, which date between 1745 and 1774. No other work has yet been found which post dates the 1774 manuscript. Reggio would only have been forty nine and it seems strange that no more works have been found. His early works range from sacred works, such as masses, oratorios and sacred songs, to aria settings of texts by Metastasio. His later works, from about 1770, consist of sonatas for cembalo, works for two violoncelli and sonatas for lute and bass.
The sonatas for cembalo consist of two movements and appear, from the limited work carried out to date, to be of a style which was popular a decade or two earlier. The works for lute and bass (violoncello?) are interesting as the lute was going out of fashion at this time.
The majority of Reggio’s works, found to date, are in manuscript form. It does, however, appear that six of the keyboard sonata was published. In Breitkopf’s Thematic catalogue, published between 1762 and 1787, is listed: ‘VI Sonate di Antonio REGGIO, a Cembalo Solo. Amsterd’. This appears in the supplement dated 1772.