Friday Photo: Damien Hirst, Guitar Hero

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,