This year’s Lucerne Festival is given its identity by having as its theme ‘Identity’. Since the word doesn’t mean anything, that isn’t a lot of help. But does a festival have to have a theme? Surely a glut of fine performances of great, or at least interesting, music is enough? Michael Haefliger, the icy artistic director, clearly doesn’t agree, and offers two accounts of identity, one in the general festival booklet, where the emphasis is on refugees and national identity, the other in the programmes for the individual concerts, where he is more metaphysical, and concludes with the hope that...