Music notation or musical notation is any system which represents aurally perceived music through the use of written symbols.
Ancient Greek musical notation was capable of representing pitch and note-duration, and to a limited extent, harmony. It was in use from at least the 6th century BC until approximately the 4th century AD; several complete compositions and fragments of compositions using this notation survive. The notation consists of symbols placed above text syllables. An example of a complete composition is the Seikilos epitaph, which has been variously dated between the 2nd century BC to the 1st century AD. Three hymns by Mesomedes of Crete exist in manuscript. The Delphic Hymns, dated to the 2nd century BC, also use this notation, but they are not completely preserved. Ancient Greek notation appears to have fallen out of use around the time of the fall of the Roman empire.
Arabic maqam is the system of melodic modes used in traditional Arabic music, which is mainly melodic. The word maqam in Arabic means place, location or rank. The Arabic maqam is a melody type. Each maqam is built on a scale, and carries a tradition that defines its habitual phrases, important notes, melodic development and modulation. Both compositions and improvisations in traditional Arabic music are based on the maqam system. Maqams can be realized with either vocal or instrumental music, and do not include a rhythmic component.
A theory on the origins of the Western solfège musical notation suggests that it may have had Arabic origins. It has been argued that the solfège syllables (do, re, mi, fa, sol, la, ti) may have been derived from the syllables of the Arabic solmization system Durr-i-Mufassal ("Separated Pearls") (dal, ra, mim, fa, sad, lam). This origin theory was first proposed by Meninski in his Thesaurus Linguarum Orientalum (1680) and then by Laborde in his Essai sur la Musique Ancienne et Moderne (1780).
The ancestors of modern symbolic music notation originated in the Roman Catholic Church, as monks developed methods to put plainchant (sacred songs) to paper. The earliest of these ancestral systems, from the 8th century, did not originally utilise a staff, and used neum (or neuma or pneuma), a system of dots and strokes that were placed above the text. Although capable of expressing considerable musical complexity, they could not exactly express pitch or time and served mainly as a reminder to one who already knew the tune, rather than a means by which one who had never heard the tune could sing it exactly at sight.
To address the issue of exact pitch, a staff was introduced consisting originally of a single horizontal line, but this was progressively extended until a system of four parallel, horizontal lines was standardized. The vertical positions of each mark on the staff indicated which pitch or pitches it represented (pitches were derived from a musical mode, or key). Although the four-line staff has remained in use until the present day for plainchant, for other types of music, staffs with differing numbers of lines have been used at various times and places for various instruments. The modern five-line staff was first adopted in France and became almost universal by the 16th century (although the use of staffs with other numbers of lines was still widespread well into the 17th century).
Because the neum system arose from the need to notate songs, exact timing was initially not a particular issue because the music would generally follow the natural rhythms of the Latin language. However, by the 10th century a system of representing up to four note lengths had been developed. These lengths were relative rather than absolute and depended on the duration of the neighbouring notes. It was not until the 14th century that something like the present system of fixed note lengths arose. Starting in the 15th century, vertical bar lines were used to divide the staff into sections. These did not initially divide the music into measures (bars) of equal length (as most music then featured far fewer regular rhythmic patterns than in later periods), but appear to have been introduced as an aid to the eye for "lining up" notes on different staves that were to be played or sung at the same time. The use of regular measures (bars) became commonplace by the end of the 17th century.
The founder of what is now considered the standard music stave was Guido d'Arezzo, an Italian Benedictine monk who lived from 995–1050 His revolutionary method—combining a four-line stave with the first form of notes known as 'neumes'—was the precursor to the five-line stave, which was introduced in the 14th century and is still in use today. Guido D'Arezzo's achievements paved the way for the modern form of written music, music books, and the modern concept of a composer.
Modern music notation originated in European classical music and is now used by musicians of many different genres throughout the world.
The system uses a five-line staff. Pitch is shown by placement of notes on the staff (sometimes modified by accidentals), and duration is shown with different note values and additional symbols such as dots and ties. Notation is read from left to right, which makes setting music for right-to-left scripts difficult.
A staff of written music generally begins with a clef, which indicates the particular range of pitches encompassed by the staff. Notes representing a pitch outside of the scope of the five line staff can be represented using ledger lines, which provide a single note with additional lines and spaces.
Following the clef, the key signature on a staff indicates the key of the piece by specifying certain notes to be flat or sharp throughout the piece, unless otherwise indicated.
Following the key signature is the time signature. Measures (bars) divide the piece into regular groupings of beats, and the time signatures specify those groupings.
Directions to the player regarding matters such as tempo and dynamics are added above or below the staff. For vocal music, lyrics are written.
In music for ensembles, a "score" shows music for all players together, while "parts" contain only the music played by an individual musician. A score can be constructed (laboriously) from a complete set of parts and vice versa.
The Indian scholar and musical theorist Pingala (c. 200 B.C.), in his Chanda Sutra, used marks indicating long and short syllables to indicate meters in Sanskrit poetry.
In the notation of Indian rāga, a solfege-like system called sargam is used. As in Western solfege, there are names for the seven basic pitches of a major scale (Shadja, Rishabh, Gandhar, Madhyam, Pancham, Dhaivat and Nishad, usually shortened Sa Re Ga ma Pa Dha Ni). The tonic of any scale is named Sa, and the dominant Pa. Sa is fixed in any scale, and Pa is fixed at a fifth above it (a Pythagorean fifth rather than an equal-tempered fifth). These two notes are known as achala swar ('fixed notes'). Each of the other five notes, Re, Ga, ma, Dha and Ni, can take a 'regular' (shuddha) pitch, which is equivalent to its pitch in a standard major scale (thus, shuddha Re, the second degree of the scale, is a whole-step higher than Sa), or an altered pitch, either a half-step above or half-step below the shuddha pitch. Re, Ga, Dha and Ni all have altered partners that are a half-step lower (Komal-"flat") (thus, komal Re is a half-step higher than Sa). Ma has an altered partner that is a half-step higher (teevra-"sharp") (thus, tivra Ma is an augmented fourth above Sa). Re, Ga, ma, Dha and Ni are called vikrut swar ('movable notes'). In the written system of Indian notation devised by Ravi Shankar, the pitches are represented by Western letters. Capital letters are used for the achala swar, and for the higher variety of all the vikrut swar. Lowercase letters are used for the lower variety of the vikrut swar.
Other systems exist for non-twelve-tone equal temperament and non-Western music, such as the Indian svar lippi. New systems that remove handicaps in existing systems are also being developed like Ome Swarlipi
The earliest known examples of text referring to music in China are inscriptions on musical instruments found in the Tomb of Marquis Ye of Zeng (d. 433 B.C.E.). Sets of 41 chimestones and 65 bells bore lengthy inscriptions concerning pitches, scales, and transposition. The bells still sound the pitches that their inscriptions refer to. Although no notated musical compositions were found, the inscriptions indicate that the system was sufficiently advanced to allow for musical notation. Two systems of pitch nomenclature existed, one for relative pitch and one for absolute pitch. For relative pitch, a solmization system was used. 
The tablature of the guqin is unique and complex; the older form is composed of written words describing how to play a melody step-by-step using the plain language of the time, i.e. Descriptive Notation (Classical Chinese); the newer form, composed of bits of Chinese characters put together to indicate the method of play is called Prescriptive Notation. Rhythm is only vaguely indicated in terms of phrasing. Tablatures for the qin are collected in what is called qinpu.
The jianpu system of notation (an adaptation of a French Galin-Paris-Cheve system) had gained widespread acceptance by 1900 C.E. In this system, notes of the scale are numbered. For a typical Pentatonic Scale, the numbers 1,2,3,5,6 would be used. Dots above or below the notes would indicate a higher or lower octaves. Time values are indicated by dots and dashes following each number. Key signatures, barlines, and time signatures are also employed. The system also makes use of many symbols from the standard notation, such as bar lines, time signatures, accidentals, tie and slur, and the expression markings. In the present-day jianpu system, only the melody is notated. Harmonic and rhythmic elements are left to the discretion of the performers.
Composers and scholars both Indonesian and foreign have also mapped the slendro and pelog tuning systems of gamelan onto the western staff, with and without various symbols for microtones. The Dutch composer Ton de Leeuw also invented a three line staff for his composition Gending. However, these systems do not enjoy widespread use.
In the second half of the twentieth century, Indonesian musicians and scholars extended cipher notation to other oral traditions, and a diatonic scale cipher notation has become common for notating western-related genres (church hymns, popular songs, and so forth). Unlike the cipher notation for gamelan music, which uses a "fixed Do" (that is, 1 always corresponds to the same pitch, within the natural variability of gamelan tuning), Indonesian diatonic cipher notation is "moveable-Do" notation, so scores must indicate which pitch corresponds to the number 1 (for example, "1=C."
Solfège is a way of assigning syllables to names of the musical scale. In order, they are today: Do, Re, Mi, Fa, Sol, La, Ti, and Do (for the octave). The classic variation is: Do, Re, Mi, Fa, Sol, La, Si, Do. These functional names of the musical notes were introduced by Guido of Arezzo (c.991 – after 1033) using the beginning syllables of the first six musical lines of the Latin hymn Ut queant laxis. The original sequence was Ut, Re, Mi, Fa, Sol, La, where each verse would start a note higher. "Ut" later became "Do". The equivalent syllables used in Indian music are: Sa, Ri, Ga, Ma, Pa, Dha, and Ni, while the 'bilinear music notation' system offers a chromatic method: Li, (Je), Ja, (Bo), Baw, Zu, (Zer or Fer), Fee, (De), Da, (Go), and Gaw. See also: solfège, sargam, Kodály Hand Signs. In China Qi is used instead of Ti (Qi for 七, Chinese 7).
Tonic Sol-fa is a type of notation using the initial letters of solfège.
The term 'graphic notation' refers to the contemporary use of non-traditional symbols and text to convey information about the performance of a piece of music. It is used for experimental music, which in many cases is difficult to transcribe in standard notation. Practitioners include Christian Wolff, Earle Brown, John Cage, Morton Feldman, Krzysztof Penderecki, Cornelius Cardew, and Roger Reynolds. See Notations, edited by John Cage and Alison Knowles, ISBN 0-685-14864-5.
Parsons code is used to encode music so that it can be easily searched. This style is designed to be used by individuals without any musical background.
Braille music is a complete, well developed, and internationally accepted musical notation system that has symbols and notational conventions quite independent of print music notation. It is linear in nature, similar to a printed language and different from the two-dimensional nature of standard printed music notation. To a degree Braille music resembles musical markup languages such as XML for Music or NIFF. See Braille music.
Beside notations developed for human readers and performers, there are also many computer oriented representations of music designed to either be turned into conventional notation, or read directly by the computer.
There are a great many software programs designed to produce musical notation. These are called musical notation software, or sometimes Scorewriters. In addition to this software, there are many file formats used to store musical information that this software and other programs can convert into notation, sound, or into some other usable form. In a sense, these file formats are a "notation" for computers.
The most common musical file format is probably the MIDI file format, which stores pitch and timing information about music (as well as velocity, volume, pitch bend, and modulation) and can be used to control a MIDI instrument which will produce the specified sound.
There are also hybrid formats, such as ABC notation, Lilypond, and MusicXML that are text files that can be read and edited by a capable human, but can also be manipulated by the computer. One notable system is the NEUMES standard, which is being used to form a computerized catalog of Medieval plainchant that can be searched by melody, text, or any encoded aspect of the music. Similarly the Mutopia project maintains a library of scores available in such formats (though they are not searchable by content).
Finally there are notational forms that are not intended to be processed by computer, but are nonetheless commonly used to transmit information via computer, such as text file guitar tablature which has become extremely popular following the growth of the World Wide Web.
A further perspective on musical notation is provided in the "Composer's Note" from Fredrick Pritchard's "Brushed With Blue", Op. 55 "(No. 2, performed by Fredrick Pritchard)", pub. Effel Publications, 2002: