On Wednesday, the Metropolitan Museum of Art opens an exhibition devoted to renowned guitar craftsmen, and a few days later, the Museum of Modern Art will unveil “Picasso: Guitars 1912-1914.” Ever the market timer, Damien Hirst is all over the art-guitars moment, and for a good cause. His 2010 “Beautiful Charity Spin Guitar” (pictured) goes on the block next Thursday, February 17, in London during Christie’s Post-War and Contemporary Art Day Sale. The manufacturer, Ontario-based Carparelli, provided the wooden semi-acoustic guitar—a Scarborough Nine—to which Hirst applied his signature spin painting and then donated to War Child, an international humanitarian organization. Proceeds from the sale of the guitar will support War Child’s work with children affected by conflict. Christie’s estimates that it will sell for between £30,000 and £50,000, or $48,420 to $80,700 at current exchange.