Analysis of the evolution of musical forms . Each of these is called a tetrachord, a succession offour notes, the second one being an exact repetitionof the first, a fifth higher. Such a repetition formswhat is known as a sequence, and it is noteworthy thatthis sequence, combined with the related tones of thecommon chord, is what gives this scale its peculiarlySLitisfying character. The minor diatonic scale, the secondary and con-trasting mode, is lacking in most of the prominentfeatures of the major The only altered degrees are those of the third andsixth, which become a semitone lower
Analysis of the evolution of musical forms . Each of these is called a tetrachord, a succession offour notes, the second one being an exact repetitionof the first, a fifth higher. Such a repetition formswhat is known as a sequence, and it is noteworthy thatthis sequence, combined with the related tones of thecommon chord, is what gives this scale its peculiarlySLitisfying character. The minor diatonic scale, the secondary and con-trasting mode, is lacking in most of the prominentfeatures of the major The only altered degrees are those of the third andsixth, which become a semitone lower ; but this deprives 26 THE EVOLUTION OF MUSICAL FORM the scale of its natural third, and of the sequencereferred to. Consequently this scale is of a morearbitrary character and has been subject to considerablevariation in its sixth and seventh degrees, but theabove mode commends itself as the one best suitedfor harmonic development. The intervals and inversions of the scale reckonedfrom the tonic, are as follows :— The Major Mode Maj. Maj. Perf. Perf. Maj. Maj. Interval 2nd 3rd + 4th 5th 6th 7th + Octave Inversion 7th 6th 5th 4th 3rd 2nd Min. Min. Perf. Perf. Min. Min. The Minor Mode Maj. Min. Perf. Perf. Min. Maj. Interval 2nd + 3rd 4th 5 th + 6th 7th + Octave Inversion 7th 6th 5th 4th 3rd 2nd Min. Maj. Perf Perf. Maj. Min. This mark ( + ) indicates the position of the semitones. There are two exceptional forms of interval, whichoccur once between the degrees of the major mode. (1) (2) :f^t: -h-
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