These three classes differ in their arrangement of the tetrachord. [Please select]
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In the diatonic, there are two consecutive tones, and the third interval of a semitone completes the tetrachord. [Please select]
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The moveable notes are those which, being arranged in the tetrachord between the immoveable, change from place to place according to the different classes. [Please select]
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In the enharmonic, the tetrachord consists of two tones and two "dieses." [Please select]
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There are four notes of the tetrachord, and there are three ratios of metre, 3/2, 2/2, 2/1, which have all their characteristics, and the feet have different characteristics as well as the rhythms. [Please select]
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The fixed notes are those which, being placed between the moveable, make up the unity of the tetrachord, and remain unaltered in their boundaries according to the different classes. [Please select]
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