Harmonics 128–256

Harmonics 128–256

Prime factorization	27
Fifth	192/128 (701.955c)

The harmonics 128–256 (also harmonic series segment 128::256 or harmonic series mode 128) are a scale that consists of harmonics 128 through 256 (128:129:…:256) and repeats at the octave. Used as a tuning system, it is also called 128afdo. It is also known as 8th octave overtone tuning and 128 tuning.

The tuning was developed by Johnny Reinhard. It differs from the scale only in that it has a fixed root and cannot be rotated. It consists of harmonics 128 (2⁷, hence 8^th octave) through 255. Scales can be selected as subsets of these 128 pitches, or the entire set can be used.

A key benefit of using pitches exclusively from the same harmonic series is that they share a fundamental. By using the 8^th octave of a harmonic series, said fundamental will almost certainly be infrasonic, but it will still have a psychoacoustic presence.

An illustratively surprising result of this higher harmonic tuning is that, since a just 4/3 does not have a power of 2 in the denominator and thus does not exist in the (octave-reduced) harmonic series, it will not be used in this tuning. Instead, when the inverse of the 3/2 ratio is needed, one may use 43/32 (511.517706¢) or 171/128 (501.423018¢).

Due to having only one prime factor (2), yet also being a higher octave of a prime mode (mode 2), it is a very strong tuning for primodality, providing a large gamut of intervals without compromising their clear prime identity.

Music

Georg Friedrich Haas

• For Johnny Reinhard (2015)

Johnny Reinhard

• True (2014)

Glenn Branca

• Symphony #3 "Gloria" (1983) – actually only the 7^th octave harmonics, but the same idea

Philipp Gerschlauer

• 128 notes per octave on Alto Saxophone (2015)

Juhani Nuorvala

• Toivo 128 (2017) recording score

Composers John Eaton, Anton Rovner, Peter Alexander Thoegersen, Monroe Golden, and others have also worked with 8^th Octave Overtone Tuning.^{[citation needed]}

External links

• Johnny Reinhard's original paper.
• 128 NOTES PER OCTAVE ON THE SAXOPHONE: HOW I DID IT AND WHY!: Saxophonist Philipp Gerschlauer on how he went about devising a 128-note per octave fingering chart
• Johnny Reinhard - 8th Octave Overtone Tuning and Bassoon Fingerings in 128
• The tuning for Nursery Tunes for Demented Children by Kyle Gann is a subset of 8th Octave Overtone Tuning.