The phrase "contemporary art music" has its own problems, of course. For example, it suggests that music from the rock and jazz worlds isn't "art" or "artistic music," which would be a weird thing to say of Joanna Newsome, Julia Holter, Elegi, Matthew Shipp, Nels Cline, Carla Bley, Bill Frisell, and many others.

I've also heard the term "university music," since nearly all composers of the type you and I are discussing were trained in music at a university, but of course that's also true for lots of rock and jazz composers.

Anyway, thanks for the link to your sampler list of works!