The Wall Street Journal occasionally does a “Walkabout” series, profiling well-known New Yorkers as they guide a journalist through a neighborhood.  The latest in the series features Kasseem Dean, better known as Swizz Beatz, the DJ and producer-extraordinaire known for hits like Beyoncé’s “Ring the Alarm” and “Upgrade U,” Busta Rhymes’ “Touch It,” and Jay-Z’s [...]