Co jest music? Co jest music? 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.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.