Median Modes in the Light of the Greek Manuscript No. 9 from the National Archives in Drobeta Turnu Severin

The Greek manuscript no. 9 from 1751 – a unique manuscript in Romania tells us more about the musical tradition of the Eastern Church, tradition which provided the unmodified safekeeping until today of the music and repertory that is an integral part of the cult of the Orthodox Church. Taking into account the importance of this manuscript for the musicological research of the ecclesiastical chant before the hrisantic reform, this study deals with different aspects from the old theory of Byzantine music, as: metrophony, solfeggio, median modes and trohos system