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Trying to explain just what Paul D. Miller (also known as DJ Spooky, That Subliminal Kid) does is like trying to describe a piece of artwork. You’re better off just seeing it for yourself. Luckily, the National Gallery of Art has provided the public an opportunity to do just that. Accompanied by violinist Danielle Cho and cellist Jennifer Kim, tonight the DJ/composer/author/philosopher will be live-mixing music inspired by songs and images from the Civil War. “A Civil War Symphony” debuted at the Metropolitan Museum of Art, in collaboration with the museum’s photography curator, who selected images to pair with the performance. At the National Gallery, he’s adapted the work to include elements from the ongoing exhibition on Augustus Saint Gaudens’ Robert Gould Shaw Memorial and the 54th Massachusetts Regiment, the group of black Civil War soldiers the memorial honors. D.C. is full of sculptures commemorating the Civil War; DJ Spooky provides a more active tribute. DJ Spooky performs at 2 p.m. at the National Gallery of Art, 6th Street and Constitution Avenue NW. Free. (202) 737-4215. nga.gov.