A song can have structure, but a song can also be like an abstract painting; if the frequency spectrum is a canvas, musical sounds are colors, shapes, brush strokes, and textures. A single song can have repetition or be completely linear; it can combine both. A song can be based on an event, feeling, thought, or ideal, but when absorbed by the listener it has the ability to invoke any kind of emotion or memory not even considered by the writer. A song can present the purest form of connection between the conscious and subconscious, but it can also display artificial vices that bridge the two. Words in songs often only tell part of the story.
Songs will soon be here.