Halfway through Cassandro, the biographical drama about the wrestler Saúl Armendáriz out now on Prime Video, the soaring ballad “Hasta Que Te Conocí” plays over a poignant scene.

Saúl (Gael García Bernal) and his mother Yocasta (Perla de la Rosa) have snuck into the backyard pool of an empty house for sale in their city, El Paso. It’s a pretty thing that they can’t afford with a yellow kitchen, and Saúl wants to buy it for them with money from his fights as soon as possible. They float in the abandoned pool and chat, somewhere between serene and melancholy, as the Mexican singer Juan Gabriel croons, “Yo sabía de cariño, de ternura. Porque a mí desde pequeño, eso me enseñó mamá.” (“I knew of affection, of tenderness because since I was little, my…