The Smithsonian Jazz Cafe closed in 2008. On Fridays from 6-10 p.m. jazz artists from the Washington, DC area performed live music in the Atrium Café, the cafeteria at the Smithsonian National Museum of Natural History at 10th Street and Constitution Avenue NW.
The Washington DC area has many live music venues. See a guide to Jazz Clubs in DC, Maryland and Northern Virginia.

