The great William Gaddis devoted a whole book (his last, Agapē Agape) to the theory that the development of the player piano marked the beginning of the end of the arts.
(Long before this final novel was published, Gaddis had already displayed an interest in the theme. As far back as The Recognitions, characters in Gaddis novels are forever announcing their intention to write a masterwork called Agapē Agape one day and ranting about player pianos as the root of all evil.)