Musical note

Musical notes are the fundamental building blocks of nearly all music. They are distinct, isolatable sounds that allow for performance, comprehension, and analysis. A note can represent a specific musical event, such as the first two identical pitches in "Happy Birthday to You." It can also refer to a general class of identically sounding events. While notes often distinguish pitch, they also serve other purposes. For unpitched percussion instruments, notes may distinguish between different instruments or different ways to strike them.

To communicate music, performers use musical notation to write notes on a staff. A staff consists of lines and spaces where each position is assigned a specific pitch. The specific pitch assigned to a line or space is determined by a clef. Musicians memorize these positions to identify pitches at a glance. Beyond pitch, notes include other essential information. Note value expresses the relative duration of a sound within a musical meter. Dynamics indicate how loudly a note should be played. Articulations describe how a performer should shape the attack and decay of a note.

Duration is a critical component of a note's identity. Note values are categorized by how they relate to one another in time. In the American system, a whole note is the longest standard value. As you halve the duration, you move through the half note, quarter note, eighth note, sixteenth note, thirty-second note, sixty-fourth note, and so on. These values can be subdivided further using tuplets. A tie can also be used to connect two notes. This creates a specific duration that a single note value cannot represent alone. A rhythm is formed by a sequence of these notes and rests.

Musicians use different naming conventions to identify pitch classes. In many European countries, the solfège system is used. This includes "fixed do," where syllables like re, mi, and fa represent specific notes in the C major scale. Other systems use "movable do" to label different major scales. In English-speaking and German regions, the first seven letters of the Latin alphabet are used: A, B, C, D, E, F, and G. Traditional Indian music uses svaras, which are named Sa, Re, Ga, Ma, Pa, Dha, and Ni. Even ancient Byzantium used a unique set of names like Pa, Vu, and Ga.

Notes within a specific tonal context are called diatonic notes. However, notes that fall outside this scale are known as chromatic notes or accidentals. Accidentals are symbols that visually communicate a modification of a note's pitch. A sharp symbol raises a pitch by a half step, also known as a semitone. A flat symbol lowers the pitch by a half step. A natural symbol cancels any previous accidentals. Advanced musicians may use double-sharps to raise a pitch by two semitones or double-flats to lower it by two. These symbols are placed to the right of a letter in text, but to the left of a notehead on a staff.

Accidentals can lead to pitch equivalences through a process called enharmonicity. For example, the note B might represent the same pitch as the note C. This creates a 12-tone chromatic scale, which adds five pitch classes to the standard seven. Different cultures name these twelve pitch classes in various ways. The German system uses "H" instead of "B" in certain contexts. In Japanese notation, symbols like "ei" and "hen" are used to indicate sharps and flats. These complex systems allow musicians to navigate a wide range of melodic possibilities.

Notes also exist in different octaves, which are groups of pitches that sound very similar. Two pitches are an octave apart if their frequencies exist in a ratio equal to a power of two. This means the top note of an octave has double the frequency of the bottom note. Middle C is a common reference point for these relationships. It sits between the treble and bass staves and has a frequency of approximately 261.626 Hz. In the standard A440 tuning, the A above Middle C is exactly 440 Hz.

To organize these various octaves, musicians use different notation systems. Scientific pitch notation uses a letter followed by an Arabic numeral, such as C4 for Middle C. Helmholtz notation uses letter case and prime symbols, such as c' for Middle C. Electronic instruments often use the MIDI standard, which assigns a number to every pitch. In MIDI, the lowest supported note is 0 and the highest is 127. These systems, ranging from ancient Byzantine names to modern digital numbers, all help us organize the vast world of sound.