Hip-hop veterans Jay-Z and Mary J. Blige have been going nonstop. Being president of Roc-A-Fella Records and being in "retirement" didn't stop Jay-Z from releasing his narrative album American Gangster, and Blige's latest release marks her ninth album. The powerful pair have matched up on the Heart of the City tour, making an appearance at 1st Mariner Arena at 7:30 p.m. Wednesday. Tickets are $49.75-$124.75. 1st Mariner Arena is at 201 W. Baltimore St. Call 410-547-7328 or go to ticketmaster.com.