I intended to write a run-of-the-mill preview of a show at Brighton Music Hall two weeks ago, featuring the Mali, West African band SMOD (and fellow West Africans Orchestra Poly-Rhthmo de Cotonou). My inability to pull this together has now dovetailed with the disturbing news of escalating violence and a massive humanitarian crisis in Mali, with the displaced Tuareg people being driven from their homes and systematically killed. A recent CNN special highlighted this part of the world and struggles that have until now escaped the notice of the West, absorbed as they are in what’s going on in Syria. But this is potentially a much larger tragedy, both in human scale and in the destruction of priceless historic artifacts and a noble culture. So now, as the world-renown Malian duo Amadou & Mariam are in town tonight at the Paradise, I find myself writing a very different sort of article.