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“Only madmen invent entirely new languages,” wrote the Viennese-born British critic Hans Keller in a 1961 essay for The Musical Times bearing the same title that adorns this column. The comment puts me in mind of Walter Boudreau’s Concerto de l’asile, one of the more substantial Canadian contemporary pieces of recent years to reach a nonspecialist public, by which I mean OSM subscribers in the Maison symphonique, who heard the premiere in January 2013 with Alain Lefèvre at the piano and Ludovic Morlot on the podium. There were performances also last year by the National Arts Centre Orchestra under Alexander…