Don't confuse this place with Stax, which is dedicated entirely to American soul music. Both deserve a visit, but Rock 'N' Soul covers more genres, including country, gospel, blues, and rock. With rare recordings, videos, photos, and interactive displays, you can walk through an entire century of American popular music. “Social Crossroads,” the first exhibition ever presented by the Smithsonian Institution outside of Washington, D.C., takes you from gospel hymns to the turn-of-the-century blues using portable audio players that allow you to select what you want to learn about or listen to as you go. Fun artifacts include a blinged-out watch that belonged to Isaac Hayes; a costume from Sam the Sham, the singer of “Wooly Bully” (who made up the words to that song on the spot, which tracks because those lyrics are some hot nonsense); and fabulous old outfits of singers such as Ann Peebles, who originally sang “I Can’t Stand the Rain” (which was eventually sampled and turned into an R&B radio hit in Missy Elliot’s “Supa Dupa Fly”). Allow an hour.