15L 4s

↖ 14L 3s	↑ 15L 3s	16L 3s ↗
← 14L 4s	15L 4s	16L 4s →
↙ 14L 5s	↓ 15L 5s	16L 5s ↘

┌╥╥╥╥┬╥╥╥╥┬╥╥╥╥┬╥╥╥┬┐ │║║║║│║║║║│║║║║│║║║││ │││││││││││││││││││││ └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘
Scale structure
Step pattern	LLLLsLLLLsLLLLsLLLs sLLLsLLLLsLLLLsLLLL
Equave	2/1 (1200.0 ¢)
Period	2/1 (1200.0 ¢)
Generator size
Bright	5\19 to 4\15 (315.8 ¢ to 320.0 ¢)
Dark	11\15 to 14\19 (880.0 ¢ to 884.2 ¢)
TAMNAMS information
Related to	4L 3s (smitonic)
With tunings	3:1 to 4:1 (parahard)
Related MOS scales
Parent	4L 11s
Sister	4L 15s
Daughters	19L 15s, 15L 19s
Neutralized	11L 8s
2-Flought	34L 4s, 15L 23s
Equal tunings
Equalized (L:s = 1:1)	5\19 (315.8 ¢)
Supersoft (L:s = 4:3)	19\72 (316.7 ¢)
Soft (L:s = 3:2)	14\53 (317.0 ¢)
Semisoft (L:s = 5:3)	23\87 (317.2 ¢)
Basic (L:s = 2:1)	9\34 (317.6 ¢)
Semihard (L:s = 5:2)	22\83 (318.1 ¢)
Hard (L:s = 3:1)	13\49 (318.4 ¢)
Superhard (L:s = 4:1)	17\64 (318.8 ¢)
Collapsed (L:s = 1:0)	4\15 (320.0 ¢)

15L 4s is a 2/1-equivalent (octave-equivalent) moment of symmetry scale containing 15 large steps and 4 small steps, repeating every octave. 15L 4s is a great-grandchild scale of 4L 3s, expanding it by 12 tones. Generators that produce this scale range from 315.8 ¢ to 320 ¢, or from 880 ¢ to 884.2 ¢. It is notable as the MOS scale of Catakleismic[19].