Ragisma
Encyclopedia
In music
and tuning
, the ragisma is an interval
with the ratio
of 4375:4374, ≈0.396 cents
. It is usually defined as the difference between the septimal minor third
(7:6) and two Bohlen-Pierce
small semitones (27:25 ). It is also the difference between minor Bohlen-Pierce
diesis (245:243) and septimal semicomma
(126:125).
Music
Music is an art form whose medium is sound and silence. Its common elements are pitch , rhythm , dynamics, and the sonic qualities of timbre and texture...
and tuning
Musical tuning
In music, there are two common meanings for tuning:* Tuning practice, the act of tuning an instrument or voice.* Tuning systems, the various systems of pitches used to tune an instrument, and their theoretical bases.-Tuning practice:...
, the ragisma is an interval
Interval (music)
In music theory, an interval is a combination of two notes, or the ratio between their frequencies. Two-note combinations are also called dyads...
with the ratio
Interval ratio
In music, an interval ratio is a ratio of the frequencies of the pitches in a musical interval. For example, a just perfect fifth is 3:2 , 1.5, and may be approximated by an equal tempered perfect fifth which is 27/12, 1.498...
of 4375:4374, ≈0.396 cents
Cent (music)
The cent is a logarithmic unit of measure used for musical intervals. Twelve-tone equal temperament divides the octave into 12 semitones of 100 cents each...
. It is usually defined as the difference between the septimal minor third
Septimal minor third
In music, the septimal minor third , also called the subminor third, is the musical interval exactly or approximately equal to a 7/6 ratio of frequencies. In terms of cents, it is 267 cents, a quartertone of size 36/35 flatter than a just minor third of 6/5...
(7:6) and two Bohlen-Pierce
Bohlen-Pierce scale
The Bohlen–Pierce scale is a musical scale that offers an alternative to the octave-repeating scales typical in Western and other musics, specifically the diatonic scale. Compared with octave-repeating scales, its intervals are more consonant with certain types of acoustic spectra. It was...
small semitones (27:25 ). It is also the difference between minor Bohlen-Pierce
Bohlen-Pierce scale
The Bohlen–Pierce scale is a musical scale that offers an alternative to the octave-repeating scales typical in Western and other musics, specifically the diatonic scale. Compared with octave-repeating scales, its intervals are more consonant with certain types of acoustic spectra. It was...
diesis (245:243) and septimal semicomma
Septimal semicomma
In music, the ratio 126/125 is called the septimal semicomma . It is also called the starling comma after its use in starling temperament, as well as the small septimal comma...
(126:125).