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Music is an art form consisting of sound and silence expressed through time. Elements of sound as used in music are pitch (including melody and harmony), rhythm (including tempo and meter), and sonic qualities of timbre, articulation, dynamics, and texture.
The creation, performance, significance and even the definition of music,
varies according to culture and social context. Music ranges from
strictly organized compositions and performances to improvisational or aleatoric forms. For purposes of discussion and exploration of the topic, music is divided into genres and sub-genres, although the dividing lines and relationships between music genres are often unclear and/or controversial. Within "the arts", music can be classified as a performing art, a fine art, or an auditory art form.
Music may also involve generative forms in time through the construction of patterns and combinations of natural stimuli, principally sound. Music may be used for artistic or aesthetic, communicative, entertainment, ceremonial or religious purposes and by many composers purely as an academic instrument for study.
Musical composition is a term that describes the composition of a piece of music. Methods of composition vary widely from one composer
to another, however in analysing music all forms -- spontaneous,
trained, or untrained -- are built from elements comprising a musical
piece. Music can be composed for repeated performance or it can be improvised; composed on the spot. The music can be performed entirely from memory, from a written system of musical notation, or some combination of both. Study of composition has traditionally been dominated by examination of methods and practice of Western classical music, but the definition of composition is broad enough to include spontaneously improvised works like those of free jazz performers and African drummers.
What is important in understanding the composition of a piece is singling out its elements. An understanding of music's formal elements can be helpful in deciphering exactly how a piece is constructed. A universal element of music is how sounds occur in time, which is referred to as the rhythm of a piece of music.
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