Time was when all the land, or at least its grooviest precincts, was listening to the rhythm of a gentle bossa nova, and Charlie Byrd was leading the laid-back charge. Three decades later, D.C.’s Latin jazz ambassador opens this summer’s “Concerts on the Canal,” just as he did when inaugurating the series 20 years ago. Appearing with Byrd’s trio are Alaor Macedo and his Band, whose upbeat dance music should provide a delightful contrast to Byrd and Co.’s dreamy sounds. Though a successful bandleader and samba composer popular in Brazil, Macedo relocated to D.C. when he married an American, and continues to pursue the beat in his new home. At 4 p.m. at the Foundry Mall, C&O Canal between 30th & Jefferson Sts. NW. FREE. (202) 866-7164. (Glenn Dixon)