# Biyatismic chords

**Biyatismic chords** are essentially tempered dyadic chords tempered by the biyatisma, 121/120.

There are two triads, nine tetrads, seven pentads and one hexad as 2.3.5.11 subgroup 11-odd-limit essentially tempered chords. In this article, voicing with the perfect fifth is prioritized.

The two biyatismic triads are in inverse relationship:

- 1-11/8-5/3 with steps 11/8-11/9-6/5;
- 1-11/8-18/11 with steps 11/8-6/5-11/9.

For tetrads, there are three palindromic chords and three pairs of chords in inverse relationship. The palindromic chords are

- 1-9/8-11/8-18/11 with steps 9/8-11/9-6/5-11/9;
- 1-11/10-11/8-3/2 with steps 11/10-5/4-11/10-4/3;
- 1-3/2-18/11-11/6 with steps 3/2-11/10-10/9-11/10.

The inversely related pairs of chords are

- 1-11/8-3/2-18/11 with steps 11/8-11/10-11/10-11/9, and its inverse
- 1-11/10-3/2-11/6 with steps 11/10-11/8-11/9-11/10;
- 1-5/4-3/2-11/6 with steps 5/4-6/5-11/9-11/10, and its inverse
- 1-6/5-3/2-18/11 with steps 6/5-5/4-11/10-11/9;
- 1-11/8-3/2-5/3 with steps 11/8-11/10-10/9-6/5, and its inverse
- 1-11/10-3/2-9/5 with steps 11/10-11/8-6/5-10/9.

For pentads, there are one palindromic chord and three pairs of chords in inverse relationship. The palindromic chord is

- 1-9/8-11/8-3/2-18/11 chord with steps of 9/8-11/9-11/10-11/10-11/9.

The inversely related pairs of chords are

- 1-11/8-3/2-5/3-11/6 with steps 11/8-11/10-10/9-11/10-11/10 and its inverse
- 1-11/10-3/2-18/11-9/5 with steps 11/10-11/8-11/10-11/10-10/9;
- 1-5/4-3/2-5/3-11/6 with steps 5/4-6/5-10/9-11/10-11/10 and its inverse
- 1-6/5-3/2-11/8-11/6 with steps 6/5-5/4-11/10-11/10-10/9;
- 1-5/4-11/8-3/2-11/6 with steps 5/4-11/10-11/10-11/9-11/10 and its inverse
- 1-11/10-6/5-3/2-18/11 with steps 11/10-11/10-5/4-11/10-11/9.

Finally, there is a palindromic hexad,

- 1-5/4-11/8-3/2-5/3-11/6 with steps 5/4-11/10-11/10-10/9-11/10-11/10.

Equal temperaments with biyatismic chords include 7, 9, 15, 16, 22, 24, 29, 31, 38, 46 and 53.