By Denny Dyroff, Entertainment Editor, The Times Vieux Farka Touré Vieux Farka Touré, who hails from Niafunké, Mali, is one of the best musicians from Africa to step onto the world stage. Touré, who will be performing at the World Café Live (3025 Walnut Street, Philadelphia, 215-222-1400, www.worldcafelive.com) on May 21, has released eight albums starting with “Vieux Farka Touré” in 2007. His...