Mary Fahl, the lead singer of October Project has a new cd out (or coming out, not sure), and I borrowed a single cd from a friend, and that final piece clicked into place.
The OP cds ended up being the perfect 'soundtrack' to an earlier novel, found after I wrote it, and always puts me in a very specific mood. Mary's songs have done it again, and made that last, final 'click' in my brain. Writing shall commence.
Anyone who's been following along might see why.