LIBERTANGO

Astor Piazzolla and Yo Yo Ma -- a beautiful tango. Tango is the music of street criminals and dangerous women, smoky hangouts, quick flashing eyes. Jorge Luis Borges described his tango stories as ''a brief and tragic mirror of the character of those hard-bitten men living on the edge of Buenos Aires before the turn of the century.'' A chorus of hookers, an intruder with a knife, a man of legendary machismo awaiting his fate at the dark end of the bar. See if you can hear the tension and the drama. Libertango.