Beta scale


The β scale is a non-octave-repeating musical scale invented by Wendy Carlos and first used on her album Beauty in the Beast. It is derived from approximating just intervals using multiples of a single interval without, as is standard in equal temperaments, requiring an octave. It may be approximated by splitting the perfect fifth into eleven equal parts . It may be approximated by splitting the perfect fourth into two equal parts , or eight equal parts , totaling approximately 18.8 steps per octave.
The scale step may also precisely be derived from using 11:6 to approximate the interval, which equals 6:5.
and
Although neither has an octave, one advantage to the beta scale over the alpha scale is that 15 steps, 957.494 cents, is a reasonable approximation to the seventh harmonic though both have nice triads. "According to Carlos, beta has almost the same properties as the alpha scale, except that the sevenths are slightly more in tune."
The delta scale may be regarded as the beta scale's reciprocal since it is "as far 'down' the circle from α as β is 'up'."
interval namesize
size
just ratiojust
error
minor third5319.006:5315.64+3.35
major third6382.805:4386.31−3.52
perfect fifth11701.793:2701.96−0.16
harmonic seventh15956.997:4968.83−11.84