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Some veteran acts tour every few years with a greatest-hits package, but Brazilian singer/guitarist Gilberto Gil prefers to change things up on each trip around the world. In 2010, Gil, who once served as Brazil’s Minister of Culture, played with a cellist and modified the tempos of some of his best-known songs; in 2012, he toured in support of his Fé na Festa album, which featured the forró rhythms common in rural parts of his country. On his current tour, Gil highlights a mostly acoustic effort from 2014, Gilbertos Samba, a tribute to bossa nova creator João Gilberto. While the album is filled with Gil’s pretty vocal melodies and emotive guitar, this legendary participant in Brazil’s radical Tropicália movement of the late ’60s and early ’70s sneaks in some revolutionary elements, befitting a guy once jailed by Brazil’s former military government. On the sweet “Desafinado,” for example, Gil and his band (which includes his multi-instrumentalist son Bem) add teakettle noises and synth washes. That combination of beautiful, wispy melodies and occasional instrumental edginess remains a Gil constant worth hearing every time he comes to town. Gilberto Gil performs at 8 p.m. at the Lisner Auditorium at George Washington University, 730 21st St. NW. $45–$75. (202) 994-6800. lisner.gwu.edu.