High Quality Content by WIKIPEDIA articles! 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. It is also the difference between minor Bohlen-Pierce diesis (245:243) and septimal semicomma (126:125). The Bohlen–Pierce scale (BP 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 independently described by Heinz Bohlen, Kees van Prooijen and John R. Pierce.

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