"Joe is an absolute genius, " says New York dealer David Nash, who used to run the impressionist and modern paintings department at Sotheby's.

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New York art dealer David Nash, who ran Sotheby's international Impressionist and modern department for many years, says that though he expects the work to fetch a high price, he's still surprised by the auction house's "Scream" strategy.

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He had a good excuse: Old friends David Crosby, Graham Nash and Young kept luring him back out on the road to tour.

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