Before Public Enemy took the stage in front of tens of thousands of fans at the Evolution Festival on Saturday, its co-founder Chuck D spoke to a group of about 50 people crowded into Legends’ Gallery .

The hip-hop innovator’s mixed-media show, “ Roll Call: Most of My Heroes Don’t Appear on No Stamps ,” is on view at the Grand Center gallery through Nov. 12. The show collects portraits of musicians the artist admires, including Harry Belafonte, Nina Simone and Woody Guthrie.

“Words can start wars and stop them, and images can do the same thing,” Chuck D said in an interview before entering the gallery for a Q&A session with attendees. “What’s actually becoming a lost skill and attribute is listening. People are listening less,” he added, “but their eyes are open and they’re loo

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