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A neji (pronounced /nɛdʒi/ "nedgy"; for "near-equal JI") is a circulating temperament which approximates an equal tuning dividing a JI equave with a subset of a mode of the harmonic series. It is often informally used for a harmonic series approximation of any non-JI scale, e.g. "neji Lydian".

In primodality

In Zhea Erose's primodality theory, nejis can be used to explore a prime family (see primodality), while keeping the transposability, scale structures, rank-2 harmonic theory, notation, etc. associated with that edo. (The neji's denominator need not be prime but primes may be preferred for sake of minimizing lower-complexity intervals. Zhea often uses semiprimes pq.) Zhea Erose's theory also deals with modulations between different prime families, and combining different prime families into one scale.


The concept behind neji is probably first proposed by George Secor in 2002[1], where he called it a quasi-equal rational tuning.

The idea has also been suggested by Paul Erlich and a feature to produce them has existed in Scala for generating them since some time in the 1990's.

Vs. detempering

Nejis are a specific type of detempering. Detempering in general does not require the rational pitch replacements to all be part of the same harmonic series.

See also