And the American Whistle Corporation is the champ when it comes to making solid-brass whistles. Amazing America’s Cameron Fontana heads to Columbus, Ohio, known as the Whistle Capital of America.

Perched on a steep hill in Montpelier, Delia Robinson’s cozy home studio is filled with dozens of whistles and vivid paintings. Robinson moved to Vermont in the early 1980s and has spent her 80-year ...