For the documentary film Fandango at the Wall, director Varda Bar-Kar followed pianist-composer Arturo O’Farrill and producer-writer Kabir Sehgal, as they prepared to record a live album at the U.S.-Mexico border wall in 2018. The project was inspired by the annual Fandango Fronterizo Festival, which unites people on both sides of the Tijuana-San Diego border each year, and features son jarocho,...