David Bowie had a great, loud, infectious laugh. So said his friend Laurie Anderson, and she imitated it: HA-ha-HA. “It was way out there — partly a musical note, but partly a cough, and partly a howl. It was not a polite British laugh,” she said. “It was just full on.” When Ms. Anderson, the musician and composer, and the widow of Bowie’s longtime collaborator Lou Reed, remembers him now, he is l