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For many music festivals, a day-long program of artists on an outdoor stage would constitute the entire thing. For the DC Jazz Festival, Jazz on the National Mall is merely the crown jewel of a two-week, 40-plus-venue event. And as crown jewels go, six-and-a-half free hours of jazz in the shadow of the Washington Monument is tough to beat. Especially when the lineup includes Nigerian world-fusioneers Toby Foyeh and Orchestra Africa; trumpet star Roy Hargrove and his hip-hop/jazz project, RH Factor; harmonica virtuoso Frédéric Yonnet; Latin-jazz pioneer Eddie Palmieri’s All-Star Salsa Orchestra; and, to end the evening, Chilean vocalist Claudia Acuña and her quartet. It’s a powerful cross-section of the current world of straight-ahead jazz—in other words, it really could be a festival all its own.

Jazz at the National Mall takes place from 1 p.m. to 7:30 p.m. at the Sylvan Theater, 15th Street SW and Independence Avenue. Free.