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Tetrachords

Recall the diatonic scale formula of TTSTTTS. A tetrachord is TTS. A diatonic scale is two tetrachords separated by a tone.

C D E F G A B C
T T S T T T S  
Lower TetrachordXX Upper TetrachordXX

The same tetrachord will do for two diatonic scales.

The lower tetrachord of C is the upper tetrachord of F. The diatonic scale of F concludes in the same way the diatonic scale of C begins, CDEF.

The upper tetrachord of C is the lower tetrachord of G. The diatonic scale of G begins in the same way the diatonic scale of C ends, GABC.

MIDI tetrachords

MIDI MIDI MIDI
Diatonic scale  
  Diatonic scale


Music Theory


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