LOS ANGELES (AP) — Fifty years ago, the music mogul Clive Davis threw a party to celebrate the release of Arista Records’ first Grammy record of the year nominee: Barry Manilow’s “Mandy.†Stevie Wonder showed up. So did John Denver and Elton John.

What was a one-off celebration for an enduring hit morphed into one of the best-known and most exclusive parties of the year: the annual hosted by Davis, held every year on the Saturday before the Sunday award show.

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