NEW YORK (Reuters) - Hundreds of tourists, some already wrapped in raincoats, clustered in New York’s Times Square on Monday afternoon to await the midnight descent of the crystal ball that has marked the arrival of the new year for more than century. Christina Aguilera, New Kids on the Block and Sting are among the musical performers who will entertain throngs filling the streets ahead of the ball drop, the focal point of New Year’s Eve celebrations across the United States.