Hip-Hop mogul Jay-Z and R&B singer Mary J. Blige have announced that they will tour North America on the 25-date “Heart of the City” tour. The tour, which is produced by Live Nation, kicks off March 22nd at Miami’s American Airlines Arena. The pair will stop in major markets like New Orleans, Houston, Las Vegas and Philadelphia. The tour will also make a stop at L.A.’s Hollywood Bowl on April 16th. Tickets go on sale on sale for the first shows beginning February 15th and are available through http://www.livenation.com/.Dates are listed below:March 22 Miami, FL American Airlines ArenaMarch 26 Baltimore, MD 1st Mariner ArenaMarch 27 Uniondale, NY Nassau Veterans Memorial ColiseumMarch 28 East Rutherford, NJ Izod CenterMarch 30 Philadelphia, PA Wachovia CenterApril 2 Toronto, ON Air Canada CentreApril 3 Boston, MA TD Banknorth GardenApril 5 Greensboro, NC Greensboro ColiseumApril 6 Washington, DC Verizon CenterApril 16 Los Angeles, CA Hollywood Bowl