7-limit

The 7-limit or the 2.3.5.7 subgroup is the subgroup of just intonation consisting of the intervals reachable by stacking 2/1, 3/2, 5/4, and 7/4.

Rank-3 subgroups:

• 5-limit
• 2.3.7 subgroup
• 2.5.7 subgroup
• 3.5.7 subgroup

Full 7-limit JI scales

Rooted Mixolydian

16:18:20:21:24:27:28:32

Septimalydian is a mode of this.

Rooted Ionian

16:18:20:21:24:27:30:32

Zil

Zil (from the temperament Godzilla which the zil series serves as a detempering of) is a series of 7-limit JI scales created from a generator sequence GS(8/7, 7/6, 8/7, 7/6, 8/7, 7/6, 8/7, 189/160).

Zil[14]

The most discussed of the zil scales is zil[14] which is chiral depending on the chirality of the interleaved 5-limit zarlino copies:

RH zil[14]

21/20
9/8
189/160
6/5
21/16
27/20
7/5
3/2
63/40
8/5
7/4
9/5
63/32
2/1

LH zil[14]

21/20
9/8
7/6
6/5
21/16
4/3
7/5
3/2
63/40
8/5
7/4
9/5
63/32
2/1

Zil[24]

Zil[24] is achiral. It has a 4×3×2 structure in the 7-limit lattice.

525/512
135/128
35/32
9/8
4725/4096
75/64
315/256
5/4
21/16
675/512
175/128
45/32
189/128
3/2
1575/1024
25/16
105/64
27/16
7/4
225/128
945/512
15/8
63/32
2/1

12:14:16:18:21:24 by 5/4

A 10-note scale with an analogous structure to zil[14] (note that these are subsets of both zil[14] chiralities):

RH

35/32
7/6
5/4
4/3
35/24
3/2
5/3
7/4
15/8
2/1

LH

16/15
8/7
6/5
4/3
48/35
3/2
8/5
12/7
64/35
2/1

Full 7-limit tempered scales

Pajara

Pajara can be used as an interpretation of 2L8s and 10L2s or their modifications. Pajara works best in 22edo.

7-limit diachrome

7-limit diachrome, an aberrismic scale, is constructed by taking a 6+4 or 5+5 fifth chain structure and tempering out 5120/5103.