27/1

27/1, the 27th harmonic, is the harmonic past 26/1 and before 28/1. It is about four octaves and nine semitones in size. Used in harmony, it sounds particularly wide: if the base note is F1, the higher note will be about D6. That is for all practical purposes beyond the range of choral music. However, it can be approached as a stack of three 3/1's, making chords like 1-3-9-27.

Interval information

Ratio	27/1
Factorization	33
Monzo	[0 3⟩
Size in cents	5705.865¢
Name	27th harmonic
Color name	c4w6 quadcowa 6th
FJS name	[math]\displaystyle{ \text{M34} }[/math]
Special properties	harmonic
Tenney norm (log2 nd)	4.75489
Weil norm (log2 max(n, d))	9.50978
Wilson norm (sopfr(nd))	9
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See also

• 27/16 – its octave-reduced form