> I do not believe there exists a formal definition other than what those
>  of us practicing "the art" believe it to be and I'll bet the responses
>  demonstrate that there is no general agreement about this.
I agree!!! I have never heard a definition of jazz music that is sufficient
and descriptive. I know jazz when I hear it, however. Likewise, I feel that
most of us working in various processes recognize alternative photography
when we see it.
Gene Laughter