Does Livenation ever stop adding these??  A third ‘Heart of the City’ show with Jay-Z and Mary J. has been added for 05.02.08 at Madison Square Garden.  They already will be at The Garden on 05.06 and 05.07 for two sold-out shows as well as a show at Nassau Coliseum.  Tickets for the third show go on-sale tomorrow with a pre-sale that started at 10:00 AM today.  Use password “HEMJJZ3″ to buy tickets now through the presale.