Sunday, June 1, 2025 at 9 p.m. on KPBS 2 / Stream now with the PBS app. The wild horse, known as the mustang, is the enduring icon of America. But in modern times it has become entangled in controversy and bureaucracy, and now its future is in question. Executive produced by Robert Redford, the film includes songs by Bruce Springsteen, Emmylou Harris & Willie Nelson.