How to define music has long been the subject of debate; philosophers, musicians, and, more recently, various social and natural scientists have argued about what constitutes music. The definition has varied through history, in different regions, and within societies. Definitions vary as music, like art, is a subjectively perceived phenomenon. Its definition has been tackled by philosophers of art, lexicographers, composers, music critics, musicians, semioticians or semiologists, linguists, sociologists, and neurologists. Music may be defined according to various criteria including organization, pleasantness, intent, social construction, perceptual processes and engagement, universal aspects or family resemblances, and through contrast or negative definition.

The art of arranging sounds in time so as to produce a continuous, unified, and evocative composition, as through melody, harmony, rhythm, and timbre. Vocal or instrumental sounds possessing a degree of melody, harmony, or rhythm.

A musical composition. The written or printed score for such a composition. c.Such scores considered as a group: We keep our music in a stack near the piano. A musical accompaniment. A particular category or kind of music. An aesthetically pleasing or harmonious sound or combination of sounds: the music of the wind in the pines.