LOS ANGELES - 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.

He called it "priceless."

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