Poetry, Dance, and Tone: these are what Richard Wagner refers to as the three "primeval sisters" comprising the artwork of the future (that is, artwork that endures the test of time). In his book, The Artwork of the Future, Wagner personifies and poeticizes these three characters--and other things and concepts--to aid the reader in understanding what he's getting at.
The aforementioned sisters are, according to Wagner, in an infinitely beautiful loving harmony when they are touching. They, when in contact, are the truest and best of what an artwork can be (he even goes so far as to say that they are actually one biological organism that shares a circulatory system, skin, etc.--they meld together). Problems arise, however, when the sisters attempt to venture out on their own.
In the section I was reading today, in which Wagner writes about Poetry, the personified version of Poetry wanders off from Dance and Tone and, in the process, essentially renders herself mortal or, generally, not capable of enduring into the future.
"...all this picturing and describing, however deftly she attempted to raise it to a special art, how ingeniously soever she laboured [sic] to fashion it by forms of speech and writing, for Art's consoling recompense,--it still was but a vain, superfluous labour, the stilling of a need which only sprang from a failing that her own caprice had bred; it was nothing but the indigent wealth of alphabetical signs, distasteful in themselves, of some poor mute."
(This "Future" of which artworks can be does not mean laser beams and aliens or anything like that, but rather a time long after (perhaps infinitely so) the artist's death. Beethoven, for example, is still a relevant name despite him having been dead and therefore unable to to perform, promote, etc. his work for nearly 200 years.)
Wagner thinks it's silly to have Poetry without the purpose of having it joined with Dance (that is, rhythm generally) and Tone, that it is lifeless if it is solely in the form of ink on paper. He likens it to a cloud full of moisture that refuses to rain despite the panting of dry seeds below.
As a sort of template for my ultimate goals in life as a creative force, this really forces one to think about the full development of a given artistic emanation: we must consider that if we artists are not creating with the intent of combination and enmeshment of our work with as many (if not all available in one's time period) forms as possible, that our work is going to basically be temporary.
I think now bigger picture, and I want to expand that. What we are doing is starting to grow legs, and in time it won't just be words and music. The endgame is that it will be words, music, visuals, video, drama, VR, film, whatever, action figures, etc. etc. yada yada yada. We aren't there yet, but I believe we'll get there. I believe.