Music theory

From Freepedia

Music theory is a field of study that describes the elements of music and includes the development and application of methods for analyzing and composing music, and the interrelationship between the notation of music and performance practice. Broadly, theory may include any statement, belief, or conception of music (Boretz, 1995)..

Music theory generally attempts to reduce the practice of composing and playing into rules and ideas. In the Western tradition, the study of music theory stems from a belief that the acts of composing, performing, and listening to music are all based on traditions that may be explicated to a high degree of detail (this, as opposed to a conception of musical expression as fundamentally ineffable except in musical sounds). Generally, music theory works are both descriptive and prescriptive, that is they both attempt to define practice and to influence later practice. Thus, music theory generally lags behind practice in important ways, but also points towards future exploration and performance. Musicians study music theory in order to be able to understand the relationships that a composer or songwriter expects to be understood in the notation, and composers study music theory in order to be able to understand how to produce effects and to structure their own works. Composers may study music theory in order to guide their precompositional and compositional decisions. Broadly speaking music theory in the Western tradition focuses on harmony and counterpoint, and then uses these to explain large scale structure and the creation of melody.

1 Sound
2 Pitch
3 Rhythm
4 Melody
5 Harmony, consonance, & dissonance
6 Notation
7 Analysis
8 External links

Sound

Music theory describes how sounds, which travel in waves, are notated, and how what is sounded, or played, is perceived by listeners. The study of how humans interpret sound is called psychoacoustics, while the cognitive aspects of how perceived sounds are interpreted into musical structures is studied in music cognition. In music, sound waves are usually measured not by length (or wavelength) or period, but by frequency.

Every object has a resonant frequency which is determined by the object's composition. The different frequencies at which the sound producers of most instruments vibrate are given by the harmonic series. The resonators of musical instruments are designed to exploit these frequencies. Different instruments have different timbres because of variation in the size and shape of the instrument.

Often the fundamental aspects of sound and music are described as pitch, duration, intensity, and timbre.

Pitch

Sounds can be classified into pitches, according to their frequencies or their relative distance from a reference pitch. Tuning is the process of assigning pitches to notes. The distance in pitch between two notes is called an interval. Notes, in turn, can be arranged into different scales and modes. The most common scales are the major and minor scales.

Rhythm

Rhythm is the arrangement of sounds in time. Meter divides time into regular intervals, called measures (or bars in British English). The time signature specifies how many beats are in a measure, and which kind of note lasts for one beat. Syncopated rhythms are rhythms in which normally unaccented beats are accented. Playing simultaneous rhythms in more than one time signature is called polyrhythm.

Melody

Melody combines notes and pitches with rhythm. In much of Western music, melody is often the most identifiable theme. Melodies will often imply certain scales or modes. Counterpoint is the study of combining and layering more or less independent melodies.

Harmony, consonance, & dissonance

Harmony can generally be thought of as occurring when two or more pitches are sounded simultaneously, although harmony can be implied when pitches are sounded successively rather than simultaneously (as in arpeggiation). Harmonies involving three or more pitches sounded simultaneously are referred to as chords, though the term is generally used to indicate an organized selection of pitches rather than just any three or more pitches.

Consonance can be roughly defined as those harmonies that sound pleasing to the ear and dissonance as those which are not pleasing to the ear. Another manner of thinking about the relationship regards stability; dissonant harmonies are sometimes considered to be unstable and to "want to move" or "resolve" toward consonance. However, this is not to say that dissonance is undesirable. A composition made entirely of consonant harmonies may be pleasing to the ear and yet boring because there are no instabilities to be resolved.

Melody is often organized so as to interact with changing harmonies (sometimes called a chord progression) that accompany it, setting up consonance and dissonance.

Notation

Music notation is the graphical representation of music. In standard notation, notes and rhythms are represented as symbols on the musical staff, along with directions indicating the key, tempo, dynamics, etc.