Roberto Emparan is a highly-esteemed physicist, known for his work on gravity, black holes and superstring theory. His fascinating book Iluminando el lado oscuro del universo: Agujeros negros, ondas gravitatorias y otras melodías de Einstein reveals the music of gravitational waves, the peculiar sound made when two black holes collide, merging into one another. At this event, the Spanish physicist will talk about this wonderful work which might change the way we see the universe.