Metallic intonation

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Metallic intonation (MTI)^{[idiosyncratic term]} is a system that is similar to just intonation, but based on the irrational metallic harmonic series rather than the harmonic series. Intervals between these metallic harmonics are used as a basis for tuning. It is related to and can sometimes overlap with merciful intonation. The metallic means are taken as basis elements of subgroups rather than primes, but not all metallic means are included because some can be expressed in terms of other metallic means, similar to how some integers are composite. For example, the fourth metallic harmonic is a redundant generator because it is the golden ratio (the first metallic harmonic) cubed.