The antonyms for the phrase "art in tune" could be "art out of sync", "art dissonant", or "art chaotic". These phrases suggest a lack of harmony, coordination, or organization in one's artistic expression. When art is "out of sync" it suggests that the various elements of the piece do not work together well or that the artwork does not fit with the intended mood or message. "Art dissonant" implies an unpleasant clash of sounds, colors, or ideas. Finally, "art chaotic" connotes a sense of disorder or confusion, suggesting that the piece lacks structure or coherence.