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Tetrachord
In music theory, traditionally, a tetrachord ((ギリシア語:τετράχορδoν), ) is a series of four notes ("chords", from the Greek ''chordon'', "string" or "note") separated by three smaller intervals that span the interval of a perfect fourth, a 4:3 frequency proportion. In modern usage a tetrachord is any four-note segment of a scale or tone row, not necessarily related to a particular system of tuning.
==History==
The term ''tetrachord'' derives from ancient Greek music theory, where it signified a segment of the Greater and Lesser Perfect Systems bounded by unmovable notes ((ギリシア語:ἑστῶτες)); the notes between these were movable ((ギリシア語:κινούμενοι)). It literally means ''four strings'', originally in reference to harp-like instruments such as the lyre or the kithara, with the implicit understanding that the four strings produced adjacent (i.e. conjunct) notes.
Modern music theory makes use of the octave as the basic unit for determining tuning: ancient Greeks used the tetrachord for this purpose. Ancient Greek theorists recognized that the octave is a fundamental interval, but saw it as built from two tetrachords and a whole tone.〔Thomas J. Mathiesen, "Greece §I: Ancient”, ''The New Grove Dictionary of Music and Musicians'', second edition, edited by Stanley Sadie and John Tyrrell (London: Macmillan Publishers, 2001): 6. Music Theory, (iii) Aristoxenian Tradition, (d) Scales.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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