The second of a series of six Smithsonian “Musica de las Americas” concerts brings to town the New York-based, Dominican Republic-rooted outfit Milly Quezada & Orchestra and guests Luis Kalaff and Joseito Mateo. From the ’70s until her husband and producer Rafael Vázquez’s death in 1996, Quezada was the lead vocalist with Milly y los Vecinos, a group that established her reputation as the “Queen of Merengue.” A cousin of salsa, merengue includes similar punchy horn work but speeds up the tempo and relies on more straight-ahead rhythms. On Vive, Quezada’s intermittently successful 1998 solo project, she scatters a handful of numbers that capture the joyous feel of her classic sound among some bombastic ballads that resemble the currently popular salsa romantica style. Ideally, she’ll stick with what established her fame tonight. At 7:30 p.m. at the U. S. Department of Agriculture’s Jefferson Auditorium, 14th & Independence Ave. SW. $20. For reservations call (202) 357-3030. (Steve Kiviat)