CRITIC'S NOTEBOOK When the reggae star Beenie Man came to the Hammerstein Ballroom on Friday, he received his usual welcome. There was a frenetic introduction. There was an exuberant crowd of thousands, waving whatever he told them to wave: hands, flags, cellphones. And out front there were about a dozen pickets, hoisting signs and chanting: "No more murder music! No more murder music!" Over the past month, Beenie Man has found himself at the center of a growing controversy over antigay lyrics in dancehall reggae, the rapid-fire genre descended from reggae. Beenie Man, one of the genre's best and most...