For his 25-year career - already? - Laurent Gerra offered himself, three days in May, the rococo golds of the Théâtre du Châtelet. A dream setting for a sold-out show, which was a moment of grace, abundant, generous, the fireworks of a Gerra at the top of his art. Both imitator and crooner, Dean Martin and Jerry Lewis in one man, he spends two hours from laughter to swing, driven by the communicative energy of Frédéric Manoukian's Grand Orchestra, augmented for the occasion by seven violins. conducted by Anne Gravoin and the legendary accordionist Roland Romanelli. "In songs" or taking the stage alone, Laurent Gerra summons, with communicative jubilation, a dream cast: Johnny (irresistibly funny when he takes over Bourvil), DSK, Sarkozy, Macias, Bellemare,