Last month, Michael Bloomberg said that he wants to leave office “having a reputation as … maybe the greatest mayor ever.” Better than Fiorello La Guardia? Well, who was New York’s greatest mayor? Or athlete? Or gangster? Or burlesque beauty? True to the spirit of the city, this is an issue of such arguments: about New York’s greatest musical, and New York’s greatest bouncer, and New York’s greatest mistake. About its greatest novel. And rock show. And gossip item. Our arguers include such legendarily milquetoast individuals as Al Sharpton, Frank Rich, Nora Ephron, Robert A.M. Stern, Thurston Moore, and our magazine’s own critics. And you get to play, too, by choosing the single best day ever. Let the shouting begin.