We can probably agree that the Ford Mustang created the ponycar market, even though the Barracuda debuted several weeks earlier. While the Barracuda was a Valiant with a contemporary fastback roofline, the Mustang was a much bigger entity: a new class of car backed by solid market research that seized upon emerging youth, female, and two-car family demographics and psychographics. Yet apparently we can't agree on whether or not a Mustang ...