Robert Plant, John Paul Jones Make (Separate) Surprise Appearances At Hardly Strictly BluegrassTwo members of Led Zeppelin made surprise appearances -- albeit separately -- at San Francisco's Hardly Strictly Bluegrass festival over the weekend. On Saturday, Robert Plant joined folk singer Patty Griffin during her solo acoustic performance at the free festival. Meanwhile, John Paul Jones, who has spent more time supporting other artists than making his own records in recent years, made three guest appearances.

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