Cohen's world tour, which began in Canada in May and resumes in Europe next month, is his first for 15 years. It has prompted a huge revival in interest in the artist including a Radio 4 documentary Leonard And Marianne, broadcast at the weekend, about his love affair with Marianne Ihlen, the wife of a Norwegian novelist and included an interview with Cohen about the relationship. The couple lived together on a Greek island after meeting in 1960. The affair was immortalised in one of Cohen's best known songs So Long, Marianne, recorded more than four decades ago - before even some of the parents of his new-found fans were born.