Pentatonic Functional Just System: Difference between revisions
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In [[13-limit]] [[superpyth]], [[11/8]] is a sub-sub-sub-<sub>5</sub>fourth, and [[13/8]] is a sub-sub-<sub>5</sub>fifth. | In [[13-limit]] [[superpyth]], [[11/8]] is a sub-sub-sub-<sub>5</sub>fourth, and [[13/8]] is a sub-sub-<sub>5</sub>fifth. | ||
In the PFJS, primes beyond 13 are classified somewhat like the FJS, based on pythagorean intervals from -5 to +6 perfect <sub>5</sub>fourths, with priority 0, 1, -1, 2, -2, etc. Unlike FJS, however, the RoT is not the same in both directions. The RoT of a pythagorean interval of <math>i</math> cents is <math>i-68</math> through <math>i+46</math> cents. This range was chosen so that it works for the 13-limit, and it spans just over an [[2187/2048|apotome]], the large step in the pythagorean chromatic scale. The exact range was set considering a few large primes: Prime [[37/1|37]] is just barely not a <sub>5</sub>m2<sup>37</sup>, but rather a <sub>5</sub>M2<sup>37</sup>; similarly, prime [[41/1|41]] is just barely not a <sub>5</sub>P3<sup>41</sup>, but rather a <sub>5</sub>s3<sup>41</sup>. | |||
{| class="wikitable right-1" | |||
|+ style="font-size: 105%" | Prime harmonics in PFJS | |||
|- | |||
! Prime !! PFJS name !! Perfect <sub>5</sub>fourths | |||
|- | |||
| [[5/4]] || <sub>5</sub>s3<sup>5</sup> || +4 | |||
|- | |||
| [[7/4]] || <sub>5</sub>M5<sup>7</sup> || -2 | |||
|- | |||
| [[11/8]] || <sub>5</sub>s4<sup>11</sup> || +6 | |||
|- | |||
| [[13/8]] || <sub>5</sub>m5<sup>13</sup> || +3 | |||
|- | |||
| [[17/16]] || <sub>5</sub>S1<sup>17</sup> || -5 | |||
|- | |||
| [[19/16]] || <sub>5</sub>M2<sup>19</sup> || -3 | |||
|- | |||
| [[23/16]] || <sub>5</sub>s4<sup>23</sup> || +6 | |||
|- | |||
| [[29/16]] || <sub>5</sub>M5<sup>29</sup> || -2 | |||
|- | |||
| [[31/16]] || <sub>5</sub>P6<sup>31</sup> || ±0 | |||
|- | |||
| [[37/32]] || <sub>5</sub>M2<sup>37</sup> || -3 | |||
|- | |||
| [[41/32]] || <sub>5</sub>s3<sup>41</sup> || +4 | |||
|- | |||
| [[43/32]] || <sub>5</sub>P3<sup>43</sup> || -1 | |||
|- | |||
| [[47/32]] || <sub>5</sub>P4<sup>47</sup> || +1 | |||
|} | |||
{{Navbox notation}} | {{Navbox notation}} | ||