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
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| Diatonic scale | ||
| Diatonic scale | ||
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