**Helmholtz pitch notation** is a system for naming musical notes of the Western chromatic scale. Fully described and normalized by the German scientist Hermann von Helmholtz, it uses a combination of upper and lower case letters (A to G),^{[1]} and the sub- and super-prime symbols ( ͵ ′ ) to denote each individual note of the scale. It is one of two formal systems for naming notes in a particular octave, the other being scientific pitch notation.^{[2]}

## History

Helmholtz proposed this system in order to accurately define pitches in his classical work on acoustics *Die Lehre von den Tonempfindungen als physiologische Grundlage für die Theorie der Musik* (1863) translated into English by A. J. Ellis as *On the Sensations of Tone* (1875).^{[3]}^{[4]} He based his notation on the practice of German organ builders for labelling their pipes, itself derived from the old German organ tablature in use from late medieval times until the early 18th century. Helmholz's system is widely used by musicians across Europe and is the one used in the *New Grove Dictionary*. Once also widely used by scientists and doctors when discussing the scientific and medical aspects of sound in relation to the auditory system, it has now largely been replaced in American and French scientific and medical contexts by scientific pitch notation.^{[5]}

## Usage

The accenting of the scale in Helmholtz notation always starts on the note *C* and ends at *B* (*C*, *D*, *E*, *F*, *G*, *A*, *B*). The note *C* is shown in different octaves by using upper-case letters for low notes, and lower-case letters for high notes, and adding sub-primes and primes in the following sequence: **C,,** **C,** **C** **c** **c′** **c″** **c‴** (or **,,C** **,C** **C** **c** **c′** **c″** **c‴**) and so on.

Middle C is designated **c′**, therefore the octave upwards from middle C is c′–b′.

Each octave may also be given a name based on the "German method" (see below). For example, the octave from **c′**–**b′** is called the *one-line octave*^{[2]} or (less common) *once-accented octave*.^{[6]} Correspondingly, the notes in the octave may be called *one-lined C*, etc.

### Variations

- The
*English multiple C notation*uses repeated*C*s in place of the sub-prime symbol. Therefore**C͵**is rendered as**CC**.^{[5]} - The
*German method*replaces the "prime" with a horizontal bar above the letter.^{[5]} - Primes in subscript (resp. superscript) may be replaced with digits in subscript (resp. superscript) indicating the number of primes (see Article and references on German Wikipedia): for example
**͵͵C**or**C**or_{2},_{2}C**c″**or**c**(but^{2}__not__).^{2}c - A system of pitch designation using uppercase and lowercase letters, commas and apostrophes in a way similar to the Helmholtz pitch notation is used in the ABC music notation system, currently used mainly for Western folk music.
- LilyPond music engraving software uses an all-lowercase variant where pitches that would be uppercase in Helmholtz notation are written with an additional sub-prime:
`c,,,`

and`c,,`

and`c,`

represent Helmholtz**C͵͵**and**C͵**and**C**respectively.^{[7]} - Scientific pitch notation is a similar system that replaces primes and sub-primes with integers. Hence
**C**in scientific notation is_{4}**c′**(middle C).

## Staff representation

This diagram gives examples of the lowest and highest note in each octave, giving their name in the Helmholtz system, and the "German method" of octave nomenclature. (The octave below the contra octave is known as the sub-contra octave).

## See also

## References

**^**The letter B is used in Germany to designate a standard B flat, H is used for B natural.- ^
^{a}^{b}Schmidt-Jones, Catherine Octaves and the Major-Minor Tonal System. Retrieved on 3 August 2007.^{[unreliable source?]} **^**"Hermann von Helmholtz".*The Concise Grove Dictionary of Music*. Oxford University Press. 1994. Retrieved 3 August 2007.**^**Helmholtz, Herman (1885).*On the Sensations of Tone (English Translation)*. p. 15. ISBN 9781602066397. In the German version of the book, Helmholtz writes: "German musicians denote the pitches of the higher octaves by accents (*strichelungen*)". Ellis notes that "English works use strokes above and below the letters, which are typographically inconvenient. Hence the German notation is retained."- ^
^{a}^{b}^{c}Blood, Brian. "Helmholtz".*Dolmetsch Online*. Staffs, clefs & pitch Notation. Retrieved 2 August 2007.^{[unreliable source?]} **^**"Definition of ONCE–ACCENTED OCTAVE".*www.merriam-webster.com*. Retrieved 2017-07-19.**^**LilyPond Notation Reference 2.18.2: 1.1.1 Writing Pitches. Accessed 2017-11-08.