I think when it comes to liteature, cinema, music one can argue that the reproduction lays in the field of distribution rather than in the creation of the work itself.
Without talking about cinema, who never had the distribution/creation apart because they are born as a industrial project, even literature mixed both. The oral, even this one have in their creation process to make easier to be kept by memory and then to be reproduced. Stuffs like the rhymes or the "Once upon a time" are there to make reproduction easier, but of course, they are not the core of the product, that stills the unique experience they tell.
Maria Callas singing Casta Diva, or Wng Kar Wei's 2046 are unique works of art, the many copies of it just aid to let more people enjoy it.
And that make us go back to Walter Benjamin who saw the socialization of art as positive result of the reproduction fo moderm age.
Of course, there goes the old story, the artwork of Robson Crusoe is not valid because no one (save himself, the cocunuts, friday and Tom Hanks) will see it and be enchanted by it.
Perhaps enchantment is the word. Nothing is more true than the stories that once enchanted and living in a Faery Realm, you will notice time will pass slower there. Enchantment is the real time machine, key to infinite. When you are enchanted then you can at once see the work of art as the intetion of the artists, his history, his social effects, how it was used, what it does mean now and how it will continue the transmition to the future generations. Perhaps the first thing about what is not art, is what does not enchant (no matter the style, the technique, even if it is pretty).
Of course I will settle down and come back from my trip now.