Josh Edge, Alaska Public Media

In a part of America that rarely makes headlines, there is a small town with a group of teenagers who will inspire, surprise and bring you to your feet with their astonishing musical virtuosity and the music they make. MARIACHI HIGH spends a year in the life of the champion mariachi ensemble of Zapata High School on the Rio Grande in south Texas. TV: Friday, 6/29 at 9:30pm

In a stunning milestone for justice in Central America, a Guatemalan court recently charged former dictator Efraín Rios Montt with genocide for his brutal war against the country’s Mayan people in the 1980s. Pamela Yates’ 1983 documentary, When the Mountains Tremble, provided key evidence for bringing the indictment. Hear the extraordinary story of how a film, aiding a new generation of human rights activists, became a granito — a tiny grain of sand — that helped tip the scales of justice. By Peter Kinoy, Pamela Yates and Paco de Onís. TV: Thursday, 6/28 at 9:00pm

The continuing saga of Cloud, the wild, white stallion, returns viewers to the Arrowhead Mountains of Montana. Cloud is now a confident band stallion in his prime. As he rules the mountains, gathering mares and expanding his reign, the story turns to his two sons. Bolder is his by birth - beautiful and golden, the success of his father and grandfather flowing in his veins. Flint, sired by another stallion, is the colt Cloud raised. Now, Bolder has gathered some mares of his own, while Flint has joined a group of bachelor stallions, young guns roaming the mountains. Who will rise to challenge the mighty Cloud? Will nature or nurture produce the next great stallion of the Arrowheads? TV: Wednesday, 6/27 at 7:00pm

Dental care can be a matter of life and death. Yet millions of Americans can’t afford a visit to the dentist. An investigation by FRONTLINE and the Center for Public Integrity reveals the shocking consequences of a broken safety net. Poor children, entitled by law to dental care, often cannot find a dentist willing to see them. Others kids receive excessive care billed to Medicaid or major surgery for preventable tooth infections. For adults with dental disease, the situation can be as dire — and bankrupting. While millions of Americans use emergency rooms for dental care, at a cost of more than half a billion dollars, corporate dental chains are filling the gaps in care, in some cases allegedly overcharging patients or loading them with high credit card debt. Correspondent Miles O’Brien investigates the flaws in our dental system and nascent proposals to fix them. TV: Tuesday, 6/26 at 9:00pm

For the dramatic ritual that opens Parliament, the queen’s coachmen don full livery, and two of her horse-drawn carriages parade through the streets. One holds the queen — the other carries the crown jewels. “Head of State” leads viewers through the elaborate state opening of Parliament, from the secret removal of the crown jewels from their Tower of London vault to the moment when the House of Commons slams the door in the face of the queen’s representative to the eventual conclusion when the rowdy Commons stand before their queen. KAKM: Monday, 6/25 at 9:00pm

The Wages of Spin chronicles The Philadelphia Music Scene from 1952 thru 1963. The film focuses primarily on Dick Clark, The Genesis of Bandstand, The Congressional Payola Hearings in 1960 and Payola. This is the first honest, comprehensive look at the inner workings of The Music Industry during this time frame. KAKM: Friday, 6/22 at 9:30pm

They slice through the water’s surface with explosive power — sail, spear and half a ton of muscle flashing in the sun. Their journeys through the open ocean are epic, their life cycle, bizarre. They are the billfish — marlin, sailfish, spearfish and swordfish — largest and most highly prized of all gamefish. Their astonishing story has never been fully told. Emmy Award-winning filmmaker and biologist Rick Rosenthal brings a lifetime of experience with these astonishing sea creatures to the screen as he observes tiny billfish nurseries in the wild, dives deep into secret undersea canyons, films incredible color-changing behavior and embarks on a quest for an elusive thousand-pound “grander.” KAKM: Wednesday, 6/20 at 7:00pm