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One of the Smithsonian Folklife Festival programs this year is “Food Culture USA,” which is billed as a look at the “American food revolution of the last 40 years.” But that doesnt mean visitors to the Mall will be hearing Native American versions of McDonald’s jingles. No, the food program is sticking to cooking demos and is leaving the music to the other three programs: “Oman: Desert, Oasis, and Sea,” “Nuestra Música: Music in Latino Culture,” and the U.S. Forest Service’s 100th Anniversary Showcase. Last year’s introductory bill of “Nuestra Música” featured groups strumming tunes by day and night; this year, Spanish-language sounds will be heard only at the evening concerts and dance parties. (Jarochos Group is pictured.) Los Camperos de Valles is a rural Mexican trio playing sharp-edged rhythms on unusually strung guitars and violin with high-pitched vocals that sometimes resemble country yodeling (Friday, June 24, & Saturday, June 25). The folky strumming and dramatic melodies of Ecos de Borinquen (Saturday, June 25) and the funky beats of Los Pleneros de la 21 will represent Puerto Rico (Saturday, July 2, & Sunday, July 3). Named after a bus stop in a San Juan neighborhood, Los Pleneros are masters of the Afro-Hispanic call-and-response genres bomba and plena. Occasionally twangy, the group sounds best when the barrel drum, maracas, and gourd-banging dominate. Drums also feature prominently in the program of music from Oman. The three large music and dance ensembles appearing from this Arabian Peninsula nation blend traditional Arabic vocals with percussion drawn from both South Asian and African traditions. A bit less exotic, the Forest Service’s roster offers campfire songs and string-band Americana. The festival runs through Monday, June 27, then picks up again Thursday, June 30, to run through Monday, July 4, on the National Mall between 7th and 14th Streets NW. Live musical performances and demonstrations are presented from 11 a.m. to 5:30 p.m., with special celebrations, performances, and concerts continuing until 9 p.m. Admission is free. Visit www.folklife.si.edu for a complete schedule, or call (202) 633-1000 for more information.