The Spanish singer Rosalía continued to defy convention with her fourth album, "Lux," recorded with the @londonsymphony, which contains lyrics in 14 languages, telling the stories of female saints and mystics through history. The self-described perfectionist who spent two years on "Lux" talks with @sethdoane about her mix of classical, opera and pop, and her almost spiritual commitment to her craft, defined by what she calls "a search for communion."