Musical system of ancient Greece

（重定向自Tone system）

The musical system of ancient Greece evolved over a period of more than 500 years from simple scales of tetrachords, or divisions of the perfect fourth, to The Perfect Immutable System, encompassing a span of fifteen pitch keys (see tonoi below) (Chalmers 1993, chapt. 6, p. 99)

单词	Tone system
释义	Tone system 原声例句科学60秒听力 2013年7月合集 It not only tones the cardiovascular system, but also produces the same relaxing effect as breathing exercises practiced in yoga. 不光能增强心血管系统，还能产生同瑜伽练习中呼吸练习一样的放松效果。英语百科 Musical system of ancient Greece （重定向自Tone system） The musical system of ancient Greece evolved over a period of more than 500 years from simple scales of tetrachords, or divisions of the perfect fourth, to The Perfect Immutable System, encompassing a span of fifteen pitch keys (see tonoi below) (Chalmers 1993, chapt. 6, p. 99)
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