Paris-based MK2 has scored a raft of sales on “Argentina,” a live-performance documentary about tango by critically-aclaimed Carlos Saura, a Nuevo Cine Espanol’s leading figure, in the run up to Ventana Sur. “Argentina” perpetuates Saura’s lyrical exploration of popular dance and song beyond “Blood Wedding,” “Carmen,””Fados” and most recently “Flamenco, Flamenco” which was released in...