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Music is an art form that involves what are sometimes organised sounds and silence, although in some forms of 20th century aleatoric, and indeed improvisational music, as well as most Eastern traditions such as Gamelou, this is not the case. It is expressed in terms of pitch (which includes melody and harmony), rhythm (which includes tempo and meter), and the quality of sound (which includes timbre, articulation, dynamics, and texture).
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 purly as an academic instrument for study.
The definition of what constitutes music varies according to culture and social context, with varied interpretations of the term being accepted under sub-genres of the art. Within "the arts", music can be classified as a performing art, a fine art, or an auditory art form.
The complete, up-to-date and editable article about Musical Interpretation can be found at Wikipedia: Musical Interpretation