The Wall Street Journal recently sent cameras to trail Professor Mark Naison, aka-The Notorious Ph.D., as he took a group of music afficionados on a trolley tour of Bronx music history. In what he referred to as the “three great traditions: Latin Caribbean, West Indian, and African American,” Naison unabashedly blasted music from a boom box, provided thoroughly academic commentary, and rapped. “Nowhere else in the world were these three traditions together,” said Naison, as the trolley swept past the home of jazz great Maxine Sullivan and a schoolyard considered “the single most important hiphop center.”