And at the memorial concert in Oslo this evening, an estimated 60 000 sang the song again. They also heard Bruce Springsteen sing "We Shall Overcome". Springsteen   Many Norwegian artists who performed sang songs written for the occasion. The roses are piling up again. Commentators are saying something resembling a "July 22 liturgy" is emerging...   The prime minister said today: "The killer failed; the people have won."