Latin American artists from throughout the hemisphere convened in Cúcuta, Colombia, Friday, on the border with Venezuela, for the Richard Branson-sponsored “Venezuela Aid Live” concert to demand dictator Nicolás Maduro allow international aid into the country. The long list of diverse artists — many who have been household names in Latin America for decades — did not shy away from making political statements in support of Venezuela’s legitimate president, Juan Guaidó, and demanding that Maduro step aside. Several artists indulged the audience in what has become a common back-and-forth chant at anti-socialist protests: “Maduro, ¡el coño de tu madre!” or...