LOS ANGELES, Sept 7: Magician David Copperfield said on Wednesday he had purchased a rare private audio tape of Martin Luther King Jr. And plans to donate the recording to a museum housed in the former Memphis, Tennessee, motel where the civil rights leader was assassinated. The superstar illusionist, who owns a library and museum dedicated to magic memorabilia, books and artifacts, declined to say how much he paid for the 10-minute reel-to-reel recording, which was discovered recently in the attic of a Tennessee home. (agencies)