The song is a piece of art in the tone or sound sequence, combination, and the temporal relationship (usually accompanied by musical instruments) to produce a composition having unity and continuity (containing the beat). And variety of tone or sound is also rhythmically with the song.
The song can be sung as solo, two (duet), three (trio) or in a gang (koir). Words in the song is usually the shape of rhythmic poetry, but there is also the religious or free prose. Songs can be categorized in many types, depending on the measure used.