Chrysanthos of Madytos (ca. 1770-1846), Gregory the Protopsaltes, and Chourmouzios the Archivist (called the Three Teachers) were responsible for a much-needed reform of the notation of Greek ecclesiastical music. Essentially, this work consisted of a simplification of the Byzantine musical symbols which, by the early 19th century, had become so complex and technical that only highly skilled chanters were able to interpret them correctly. Despite its numerous shortcomings the work of the three reformers is a landmark in the history of Greek Church music, since it introduced the system of neo-Byzantine music upon which are based the present-day chants of the Greek Orthodox Church.