I suspect all artists are as bedeviled by what to leave out of a work as by what to include. The canvas, score or page is only so large, and though one could theoretically keep writing a piece of music or prose without end (until death parts you from it), no sane person would try to keep listening or reading. But truly, to begin a creative work is often to be overflowing with potential material and overwhelmed by how to shape and contain it. You have to be careful it doesn’t sprawl all over whatever medium you’re using with either…