This is the sound, the story, of the M’berra Ensemble, a collective of Malian musicians from the M’berra Refugee Camp in southeast Mauritania, and Italian producer and electro-shaman Khalab. In a sprawling tent city rising out of the desert, out of nothingness, at the border with Mali in West Africa, brought together by spirit and circumstance, the group’s Arab and Tuareg members — some unknown, some who have previously toured Europe — find solace and beauty in music and song.