I've never seen America as being one place, but I think the record industry people I've spoken to - although they will acknowledge that the cities are completely different from each other - I think they still handle it as being one territory. ↗
Sometimes they are a matter of luck; the photographer could not expect or hope for them. Sometimes they are a matter of patience, waiting for an effect to be repeated that he has seen and lost or for one that he anticipates. ↗