Keywords: Parallage Ioannis Plousiadinos.jpg en Solfeggio for the triphonic tone system used in 15th-century Byzantine chant 2012-07-01 Athos Docheiarios Monastery MS 319 folio 18 verso ascribed to Ioannis Plousidinos 1429 “1500 copist unknown scribe 18th century PD-Old PD-US-unpublished Uploaded with UploadWizard Byzantine music Papadike Music theory Enechemata |