Musical notation
Music notation is a system of writing for music. The term sheet music is used for written music to distinguish from audio recordings. In sheet 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.Present day standard music notation is based on a five-line staff with symbols for each note showing pitch and duration. Pitch is shown using the diatonic scale, with accidentals to allow notes on the chromatic scale, and duration is shown in beats and fractions of a beat.
Standard notation described
Elements of the staff
A staff (in British English, also stave) is generally presented with a clef, which indicates the particular range of pitches encompassed by the staff. A treble clef placed at the beginning of a line of music indicates that the lowest line of the staff represents the note E above middle C, while the highest line represents the note F one octave higher. Other common clefs include the bass clef (second G below middle C to A below middle C), alto clef (F below middle C to G above middle C) and tenor clef (D below middle C to E above middle C). These last two clefs are examples of C clefs, in which the line pointed to by the clef should be interpreted as a C. In a similar fashion, the treble clef points to a G and the bass clef points to an F.
In early music, the clef was written as a letter and its location on the staff was chosen by the writer. The treble clef and bass clef used today are stylized versions of the letters G and F, respectively. Their locations are now standardized. Unusual clefs are used for certain instruments, such as the Bb clef used for some horn music and the low G clef used for classical guitar music and four-part men's choral music.
Following the clef, the key signature on a staff indicates the key of the piece by specifying certain notes to be held flat or sharp throughout the piece, unless otherwise indicated. The key signature is presented in the order of the circle of fifths, with flats B-E-A-D-G-C and sharps in the opposite order, F-C-G-D-A.
Another common element of a staff is the time signature, which indicates the rhythmic characteristics of the piece. Time signatures generally consist of two numbers; the upper number indicates the number of beats per measure (or "bar"), while the lower indicates what sort of note constitutes a "beat". A time signature of 4/4 (also known as "common time" and sometimes indicated with a large "C" symbol) implies that there will be four beats per measure, with each beat constituting a quarter note. A signature of 2/2 (or "cut time", a "C" with a vertical slash) allows 2 beats per measure, with each half note lasting a beat. This is important, because the first beat of each bar is generally stressed. Less commonly, music that lacks rigid rhythmic organization is written without a time signature.
Notes representing a pitch outside of the scope of the five line staff can be represented using leger lines, which provide a single note with additional lines and spaces. Octave (8va) notation is used, particularly for keyboard music, where notes are substantially above or below the staff.
Multiple staves can be grouped together to form a staff system. A system is used where two staves are required to cover the range of the instrument (as with a keyboard instrument), or where multiple related instruments are played (as with three violin parts on a score). A score for ensemble music includes multiple systems, as does most organ music (where the pedals are written as a seperate system).
Various directions to the player regarding matters such as tempo and dynamics are added above or below the staff, often in Italian (sometimes abbreviated). For vocal music, lyrics are written.
Here is a diagram of some common musical notation.
Development of music notation
The ancestors of modern symbolic music notation originated in the 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 neums (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 standardised on. 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 4-line staff has remained in use until the present day for plainchant,