[Afropop] The Gnawa musical healers of Morocco are a perennial fascination within the broad tableau of the Afropop story. They bring together potent themes--slavery and its legacy of displacement and diaspora, music that induces trance and even spirit possession, and the paradox of ancient African realities finding their place in the contemporary world. The music is instantly recognizable and surprisingly durable. More than 20 years after I first heard the boom and thwack of a well-played sinter (3-stringed,