One balmy October day in Havana, as the Cuban French sister act Ibeyi plotted the video for “Offerings” — an electro-spiritual ballad from the new album “Offering,” released in June — Lisa-Kaindé Díaz unceremoniously asked her twin Naomi Díaz, to ceremoniously shave her head on camera. Naomi was accustomed to Lisa-Kaindé’s whims long before they became professional artists. But to take a blade to her sister’s voluminous curls would be a bridge too far. “I was like, ‘Hell no. I’m not doing that!’” Naomi recalled to The Times, over a Zoom call from Paris. “As always, when I come with my woo-woo stuff, Naomi is eye rolling like, ‘Girl, what is this s—?’” said Lisa-Kaindé. “But this time around, Naomi was like, ‘OK.’” The music video ended with Lisa-Kaindé releasing her locks into the sea. At the core of Ibeyi, which translates to “twins” in the Yoruba language, is the polarity between sisters. Lisa-Kaindé is the bleeding heart who whispers divinity into her lyrics, and Naomi grounds them with the beating pulse of her percussion. …