About four and a half minutes into Bad Bunny's Super Bowl performance, the music slowed, and he began to introduce himself to the audience. That's when you could see Giancarlo Guerrero. Guerrero, the artistic director and principal conductor for Chicago's Grant Park Music Festival, performed on a global stage last night, leading dozens of violin players during the halftime show. "He was aware of me and my career, and asked specifically for me," Guerrero explained. Here's what happened when Guerr