Dasian notation [daseian]
- David Hiley
A Western system of notation used in the 9th and 10th centuries. It was based on a set of signs deriving from the daseia of ancient Greek prosody, a symbol that indicated the rough breathing (‘h’ at the start of a word) and was originally written as, and later as a round sign '. The signs of dasian notation (the full set contains 18) are used in a group of treatises of the late 9th and 10th centuries, principally the Musica enchiriadis, Scholica enchiriadis and the Commemoratio brevis de tonis et psalmis modulandis (ed. Schmid). The spelling ‘dasia’ is used in these treatises. The intervals between the signs are clearly defined so that the musical examples in these treatises may be transcribed accurately. (For illustration, see Notation, §III, 1, ex.4; see also Notation, §II, 7 and Organum, §2.H. Schmid, ed.: Musica et Scolica enchiriadis una cum aliquibus tractatulis adiunctis...