Often confused for Jules Ghys - possibly his brother, or perhaps they are the same person.
Fétis (Biographie universelle des musiciens) names only Joseph Ghys, but lists some works that are in fact published under the name of Jules Ghys.
Becker (Die Tonkünstler des neunzehnten Jahrhunderts: ein kalendarisches Handbuch) names only Joseph Ghys, but gives 1837 and 1845 as the date of his first Leipzig concert.
Death notice in Le Mémorial des Pyrénées (1848-09-27) names Jules Ghys, died St. Petersburg 1848-08-22. Most other obituaries name Joseph Ghys.
Several sources give 1804 as year of birth for Joseph Ghys