At its most basic, Mr. Astaire's technique has three elements - tap, ballet and ballroom dancing. The ballet training, by his account, was brief but came at a crucial, early age. He has sometimes been classed as a tap dancer, but he was never the hoofer he has jokingly called himself. Much of the choreographic outline of his dancing with his ladies-be it Miss Rogers or Miss Hayworth-is ballroom. But of course, no ballroom dancer could dance like this.