By 1961, Ford was clear that they wanted to develop a sporty coupe based on the Falcon platform. The first three concepts that ultimately formed the Mustang model were the Avventura, Avanti, and Allegro, respectively. Over the course of the first three models, the Avventura was shown as a hatch with rear-facing back seats. While that idea itself never happened, it did instigate a second body style they produced side by side with the coupe - the Fastback.
Ford did show a concept car named ‘Mustang' in 1962, but in all reality it was much more of a brand halo concept - a more visionary model to stir excitement for what was to come with the production Mustang anything that would actually be built.
Over the years, there have been some beautiful concepts, and frankly some real head-scratchers. For your amusement, here they are - the good, the bad, and the ugly. Enjoy.