Music and the artists that create it are recurring themes in the work of filmmaker Frank Scheffer. He has created a unique 90-minute docu-concert for IDFA on Stage, in which excerpts from his latest feature-length documentary (working title: Intensely Soulful) are weaved together with live music by the musicians featured in the film. 　　Clarinetist and composer Kinan Azmeh and mez...