Further Developments Latex and Lilypond now with Arara and International Unicode Text via XeLatex

The title might be a white lie, because while I did get arara working, in combination with a bash script, to automate the steps to render the hymnal.

Good news. One of the arara developers helped me solve the problem. Stack overflow:

The solution ends up being quiet simple. The only limitation is that we are not outputting the lilypond-book content to a subdirectory as originally planned.

At the top of the music.lytex file (after configuring arara as directed in the referenced post),