At a press conference today Mayor Bloomberg showed a surprising command of Jay-Z's music. The pair were on hand to discuss the start of the vehicle-free "Summer Streets" program, per the Observer's Azi Paybarah someone noted how one of the hip-hop mogul's song "describes how his mother taught him to ride a bike at a young age." Bloomberg cut in, "This is from, 'Mother I Made It?'" surprising even Jay-Z, who confirmed the Mayor was......