7-limit

Harmonic seventh  Play (help·info), septimal seventh.

Septimal chromatic semitone on C  Play (help·info).

7-limit or septimal tunings and intervals are musical instrument tunings that have a limit of seven: the largest number contained in the interval ratios between pitches is a multiple of seven.

For example, the harmonic seventh has the ratio 7:4 and is thus a septimal interval while the greater just minor seventh, 9:5  Play (help·info), is not. Similarly, the septimal chromatic semitone, 21:20, is a septimal interval as 21÷7=3.

See also

• Đàn bầu
• Tonality diamond#7-limit tonality diamond

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