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Octave species
In early Greek music theory, an octave species (εἶδος τοῦ διὰ πασῶν, or σχῆμα τοῦ διὰ πασῶν) is a sequence of incomposite intervals (ditones, minor thirds, whole tones, semitones of various sizes, or quarter tones) making up a complete octave . The concept was also important in Medieval and Renaissance music theory.
==Ancient Greek theory==
Greek theorists used two terms interchangeably to describe what we call species: ''eidos'' (εἶδος) and ''skhēma'' (σχῆμα), defined as "a change in the arrangement of incomposite () making up a compound magnitude while the number and size of the intervals remains the same" ( (da Rios), translated in ). Cleonides (the Aristoxenian tradition) described (in the diatonic genus) three species of diatessaron, four of diapente and seven of diapason. Ptolemy in his "Harmonics" called them all generally "species of primary consonances" (εἴδη τῶν πρώτων συμφωνιῶν). Boethius, who inherited Ptolemy's generalization under the term "species primarum consonantiarum" (Inst. mus. IV,14), expanded species theory of Greeks; along with the traditional orderings of three primary species he introduced three further their orderings . For epistemology of the Antiquity music theory, the most important of all was the octave species, because "from the species of the consonance of the diapason arise what are called ''modes''" .
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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