3L 3s

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↖2L 2s↑3L 2s 4L 2s↗
←2L 3s3L 3s4L 3s→
↙2L 4s↓3L 4s 4L 4s↘
Brightest mode LsLsLs
Period 1\3
Range for bright generator 1\6 (200¢) to 1\3 (400¢)
Range for dark generator 0\3 (0¢) to 1\6 (200¢)
TAMNAMS name triwood
TAMNAMS prefix triwd- (abbr. trw)
Parent MOS none
Sister MOS 3L 3s
Daughter MOSes 6L 3s, 3L 6s
Equal tunings
Supersoft (L:s = 4:3) 4\21 (228.6¢)
Soft (L:s = 3:2) 3\15 (240¢)
Semisoft (L:s = 5:3) 5\24 (250¢)
Basic (L:s = 2:1) 2\9 (266.7¢)
Semihard (L:s = 5:2) 5\21 (285.7¢)
Hard (L:s = 3:1) 3\12 (300¢)
Superhard (L:s = 4:1) 4\15 (320¢)

3L 3s, named triwood, is an octave-equivalent moment of symmetry scale containing 3 large steps and 3 small steps, with a period of 1 large step and 1 small step that repeats every 400¢, or 3 times every octave. Modes of this scale are rotations of the step pattern LsLsLs. Generators that produce this scale range from 200¢ to 400¢, or from 0¢ to 200¢.

The true MOS is LsLsLs but interesting near-MOSs include LLsLss and LLssLs. The MOS is always proper but the other forms are only proper if the generator is larger than 1\9 of an octave (so not augmented).

Out of all proper six-note MOS scales, this augmented scale probably has the lowest harmonic entropy.

Scale tree

Generator Cents L s L/s Comments
Chroma-positive Chroma-negative
1\6 200.000 200.000 1 1 1.000
6\33 218.182 181.818 6 5 1.200
5\27 222.222 177.778 5 4 1.250
9\48 225.000 175.000 9 7 1.286 Oodako
4\21 228.571 171.429 4 3 1.333
11\57 231.579 168.421 11 8 1.375
7\36 233.333 166.667 7 5 1.400
10\51 235.294 164.706 10 7 1.428
3\15 240.000 160.000 3 2 1.500
11\54 244.444 155.556 11 7 1.571
8\39 246.154 153.846 8 5 1.600 Triforce
13\63 247.619 152.381 13 8 1.625 Unnamed golden tuning
5\24 250.000 150.000 5 3 1.667
12\57 252.632 147.368 12 7 1.714
7\33 254.545 145.455 7 4 1.750
9\42 257.143 142.857 9 5 1.800
2\9 266.667 133.333 2 1 2.000 Basic triwood
9\39 276.923 123.077 9 4 2.250
7\30 280.000 120.000 7 3 2.333 Deflated (optimal around here)
12\51 282.353 117.647 12 5 2.400
5\21 285.714 114.286 5 2 2.500
13\54 288.889 111.111 13 5 2.600 Unnamed golden tuning
8\33 290.909 109.091 8 3 2.667
11\45 293.333 106.667 11 4 2.750 August
3\12 300.000 100.000 3 1 3.000 Trug (optimal around here)
10\39 307.692 92.308 10 3 3.333 Augene
7\27 311.111 88.889 7 2 3.500
11\42 314.286 85.714 11 3 3.667
4\15 320.000 80.000 4 1 4.000 Inflated
9\33 327.273 72.727 9 2 4.500
5\18 333.333 66.667 5 1 5.000
6\21 342.857 57.143 6 1 6.000 Hemiug↓, hemiaug↓
1\3 400.000 0.000 1 0 → inf