I was privileged to see Hilary Hahn in rehearsal at Detroit’s Orchestra Hall in 2008, thanks to an invite from a friend. Hahn is not only the greatest violinist on the planet, she’s the most beautiful. Hilary attended Philly’s famed Curtis Institute of Music. Last week while sitting in Rittenhouse Square I saw Ms. Hahn with entourage walking across the square. I also thought I’d seen her walking down 17th the night before-- though about that I may have been mistaken! The point: You never know who you’ll see in Philadelphia.