Astor Piazzolla wrote and performed some of the most affecting music of the 20th Century - rooted in the tango tradition but expanded and renewed by elements from European classical music, klezmer, and jazz. As a result, what was once dance music in Buenos Aires has become, reimagined by Piazzolla, part of the repertoire of chamber groups and symphonic orchestras around the world. A new musical biography of the legendary Argentine composer is written by Lesley Karsten and Stephen Wadsworth, and