Under normal circumstances, only necessity would draw any Frenchman to Maubeuge (pop. 30,000), a cheerless, Hoboken-like manufacturing center up near the Belgian border, where the moonor, for that matter, the sunshines rarely on the River Sambre. But all summer long the roads to Maubeuge have been jammed with moonstruck vacationers, honeymooners and touring rubbernecks, all lured there by what promises to become Europe's next popular hita tango called Un Clair de Lune à Maubeuge (Moonlight at Maubeuge).*
Since Moonlight came out last February, it has sold a phenomenal 1,700,000 disks. It has...