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Daseian notation (or dasian notation) is the type of musical notation used in the ninth century anonymous musical treatises ''Musica enchiriadis'' and ''Scolica enchiriadis''. The music of the ''Musica enchiriadis'' and ''Scolica enchiriadis'', written in Daseian notation, are the earliest known examples of written polyphonic music in history.〔Burkholder, Grout, and Palisca. ''A History of Western Music''. Norton, 2006, p. 88.〕 ==Usage== Musicologist Willi Apel has called the notation "a mediaeval imitation of the ancient Greek notation".〔Apel, Willi. ''The Notation of Polyphonic Music, 900-1600''. Revised 4th edition. Cambridge, MA: Mediaeval Academy of America, 1953, pp. 204-206.〕 The treatises themselves refer to it as "dasia"; the word derives from the Greek ''daseia'', which refers to "rough breathing" at the start of a word in spoken prosody.〔Hiley, David. "Dasian () Notation". ''The New Grove Dictionary of Music and Musicians'', ed Stanley Sadie. London:Macmillan, 2001.〕 Daseian notation makes use of a staff of varying numbers of lines, from four to as many as eighteen, as well as a system of four shapes which are rotated in various ways to represent the full gamut of eighteen pitches used in the treatises. These eighteen pitches are based on a system of four repeating hexachords, resulting in the following scale: The notational signs were then placed at the far left of the staff (similar in placement to modern clef), and some illustrations are supplemented with "T" and "S" in between the signs so as to clarify the placement of semitones.〔Grout, p. 90.〕 Syllables of the spoken words were then written on the staff lines (see example above). If the pitch changed, the word syllables would be raised or lowered to a different staff line. This was used to notate organum in two, three and four-voice styles.〔 In addition to the ''Enchiriadis'' treatises, this notation is also used in the ''Commemoratio brevis de tonis et psalmis modulandis'' treatise.〔 However, despite the wide circulation of the ''Enchiriadis'' treatises, this notation was not widely used in practical sources. Music manuscripts of the ninth and tenth centuries record almost exclusively monophonic music, and even the extant sources of polyphonic music, such as the Winchester Troper, are written in unheighted neumes.〔Hoppin, pp. 198-199.〕 This would continue until the development of the widely used staff system of Guido of Arezzo in the eleventh century. Philipp Spitta was the first modern musicologist to correctly interpret this notation, in an 1889 publication.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Daseian notation」の詳細全文を読む スポンサード リンク
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