ビザンティン聖歌
Konstantinos Psachos studied the notation of Byzantine and ancient Greek music. He invented a keyboard musical instrument, the Panarmonio of Eva, dedicated to his friend and pupil, Eva Palmer-Sikelianou, in order to perform Byzantine music in a more authentic manner. He wrote music for ancient tragedies and proposed the harmonization of Byzantine music with the use of two or three resonant lines instead of only one.