Music is an art form which includes audible sounds and silence. It is usually expressed in terms of pitch, rhythm and sound quality. Music can include complex shapes and generative forms by building models and combinations of natural stimuli mainly sound. Music can be used for artistic or aesthetic, communicative, entertainment, or ceremonial purposes. The definition of what constitutes music depends upon the cultural and social context.
The broadest definition of music is organized sound. There are clear patterns that are widely labelled music, and while there are clear cultural differences, properties of music are the properties of sound as perceived and processed by humans and animals.
Greek philosophers and medieval theorists defined music as tones ordered horizontally as melodies and vertically as harmonies. The theory of music in the world, is studied with pre-assumption that music is orderly and often pleasant to hear.
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