In 2011, the cancer returned, and Casal underwent more treatment with chemo and radiation. She did not allow herself to slow down, however. Instead, she began an international tour that took her from Beijing to Montreal. In 2013, she resurrected an older idea that had been gestating for years: Creating an annual music festival in Boimorto, the Galician village where she was born. El Festival de la Luz was designed as a charitable event; all proceeds from the box office were allocated to the Asociación Española Contra el Cáncer during its inaugural year and Al Banco de Alimentos in 2013.
Also in 2013, after six years of not recording a studio album, Casal issued a double disc. In Spain it was titled Almas Gemelas and simply Almas in the rest of the world. The ten songs on disc one were all in Spanish and the second disc's seven songs were recorded in French, Portuguese, and Italian, and composed by Vangelis, Luigi Tenco, Benjamin Biolay, and Antonio Carlos Jobim. She cut the set at the historic EastWest Studios in Los Angeles. She toured Europe, Asia, and North America in support and finished her cancer treatments, going into remission. In 2017, she released the French-only Luz Casal Chante Dalida, A Mi Manera, a tribute to the great French songstress, followed a year later by Que Corra el Aire. Produced by Ricky Falkner (Love of Lesbian, Quique González), it was prefaced by the hit single "Miénteme al Oído." The album rocketed to the number two spot on the Spanish albums chart and was followed by a national tour. ~ Evan C. Gutierrez, Rovi