Passion comma

The passion comma (ratio: 262144/253125, monzo: [18 -4 -5⟩, is a medium 5-limit comma measuring about 60.6 cents. It is the amount by which a stack of five classical minor seconds (16/15) exceeds the perfect fourth (4/3). According to an analysis in The Harmonic Experience by W. A. Mathieu, Beethoven's Appassionata sonata pumps this comma, leading to its name passion as was given by Paul Erlich in 2004.

Interval information

Ratio	262144/253125
Factorization	218 × 3-4 × 5-5
Monzo	[18 -4 -5⟩
Size in cents	60.61143¢
Name	passion comma
FJS name	[math]\displaystyle{ \text{ddd3}_{5,5,5,5,5} }[/math]
Special properties	reduced, reduced subharmonic
Tenney norm (log2 nd)	35.9495
Weil norm (log2 max(n, d))	36
Wilson norm (sopfr(nd))	73
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Temperaments

Tempering out this comma leads to the 5-limit passion temperament. See Passion family for the family of rank-2 temperaments where it is tempered out.