War Music has been praised by music critics. Reviewing the world premiere, Peter McCallum of The Sydney Morning Herald described it as one of Ledger's "strongest scores" and remarked, "In the first part, ominous, sometimes militaristic ideas mixed with scattered sounds, bumps and fleeting fragments in finely textured music that loomed in waves towards peaks of intensity, serenity and portentousness. The second part brought in the voices of the Gondwana Centenary Chorale with guest members from France, Turkey and New Zealand for an intimate and anguished setting of a poem by Paul Kelly written as though through the voices of the slain."[2] James McCarthy of Limelight similarly observed, "Ledger is resourceful enough to keep our interest, offering many rewards during the course of the work. With his imaginative orchestration, Mr. Ledger is becoming one of our best composers."[3]
At a later performance by the New Zealand Symphony Orchestra and the New Zealand Youth Choir, William Dart of The New Zealand Herald wrote, "James Ledger's War Music took 20 minutes for its first movement to travel from brooding mysteries to full symphonic fury, with the musicians easily meeting the Australian's directives of 'bellicose and vehement.'" He continued, "Less belligerent, shorter and more affecting was the following movement in which the New Zealand Youth Choir added a skilfully layered setting of Paul Kelly's words, powerfully linking past and present, war and peace."[5]