I re-suspended the loose charcoal in the picture posted previously in very wet white gouache. White and Prussian blue acrylic were applied in selected areas. The white acrylic pushed the gouache wash away whereas the blue slowly bled into it. The migrating washes (below) were left to dry overnight and then the whole layer fixed (above).
The music was by Elena Kats-Chernin, the haunting Works for Piano Trio.
I am thinking how to draw back into this.