I was listening to Danielpour's Concerto for Orchestra and noticing the recurring theme as it passed from part to part, popping up in a variety of contexts. Sometimes when the overall tone was almost melodious and sometimes when it was present in the midst of conflict and cacophony. But always there, providing a foundation for all that was going on around this and proving itself adaptable in its many settings.
Among other things, I am teaching a class on disaster preparedness and response. And one of the principles in preparedness is you have to have a framework that is usable in normal everyday situations and adaptable for all sorts of situations that can arise. Because a plan of response that cannot adapt will never be used. And here is a theme that somehow does the same, even as its environment and its place within the environment changes, the theme finds a place. Sometimes up front. Sometimes supporting. But providing a unity to the piece along the way. A good trait to have in a storm.