Astor Piazzolla's broadening of the world of tango made headway abroad before it won wide acceptance in his native Argentina. And, although he studied with Alberto Ginastera and Nadia Boulanger, it was not until close to the end of his life (he died in 1992) that he began to get the attention of classical performers. Dutch violinist Isabelle van Keulen and the ensemble she formed in 2011 with Christian Gerber (bandoneón), Ulrike Payer (piano) and Rüdiger Ludwig (double bass) offer 11 well-chosen numbers – including Oblivion, Libertango and Concierto para Quinteto – and are what you might call soberly passionate advocates of the style that has become known as nuevo tango. If you want a deeper vein of fantasy, there's always Gidon Kremer on Nonesuch to turn to. challenge.nl