JL - OF COURSE it's the attention to aesthetic apart from the function that is part of setting it apart as art. The original funtion of cooking is substinance, not enjoyment. We paint houses* and we paint canvasses.
(* - of course house painters can be artists... or at least the Medicci's thought so)
I'm being deliberately terse and vague for the exact reason that the music theory, literary theory, and art theory that I know, I know to be lacking. I know enough to know I can't speak with any kind of detail and precision. However, I still believe there is legitmacy in my original claim that anything can be art (I have seen too much artistry in manifold fields to relegate art to museums, performance halls, and libraries).
(I kick myself for referencing rebirth artists instead of my men, Rivera, Orozco, and Siqueiros. I will listen to Augustine Lara only tonite to repent)
And a Velvet Elvis in a trailor is not necessarily art, but you'd be a fool to argue that it can not be art.