U2’s Bono called Leonard Cohen’s song “Hallelujah” “the most perfect song in the world.” It’s mournful and triumphant, despairing and uplifting. It’s a riddle that improbably offers cathartic release. More than 300 singers have covered it; it’s even been the subject of books. And yet it was tough for Cohen to compose. He wrote more than 80 verses before choosing the few for the final version; in one famous session, he banged his head on the floor to stimulate his creative flow. “To find that urgent song,” he said, took “a lot of work and a lot of sweat.” I nominate “Hallelujah” as one of your sacred symbols for the next 12 months. From strenuous effort come masterful creations.