Villa-Lobos did something of that kind based on the skyline of New York, GG. Things can be surprisingly melodic and easy on the ear when one is not expecting it.
Writing the above brought something back to me. I once told Keith Tippett about a recording of his and Julie's having been found unacceptable as serious music by my father because it had been improvised on the spot, rather than written out beforehand. "Next time", Julie said, "play it to him without mentioning that it's freely improvised, and see how he reacts". I did. Afterwards I asked what he thought of it. "Most impressive", he replied, adding "I'd like to hear some more music by that composer sometime, If you've got any"!
