261/256
| Ratio | 261/256 |
| Subgroup monzo | 2.3.29 [5 -6 1⟩ |
| Size in cents | 33.48719588¢ |
| Names | 29-limit ~sixth tone (HEJI) |
261/256, or the 29-limit ~sixth tone, is a 2.3.29 subgroup comma. It is the amount by which 29/16 (the 29th harmonic) exceeds the Pythagorean minor seventh (16/9). It is significant in Helmholtz-Ellis notation as the formal comma to translate a Pythagorean interval to a nearby 29-limit (prefix???) interval.