Los Lobos performs at City Winery on Dec. 21, 2018. (Photo by Ben Eisendrath/Instagram+Twitter: Insomnigraphic/GrillworksBen)

Initially formed by singer and guitarist David Hidalgo and guitarist/percussionist Louie Perez in 1973, the lineup of East Los Angeles band Los Lobos hasn’t changed in more than three decades. They know each other’s playing really, really well. And even though they scored a #1 hit with their cover of Ritchie Valens’s arrangement of the traditional song “La Bamba” on the soundtrack to the 1987 film of the same name, Los Lobos have never stopped being a blue-collar band in the very best sense: hardworking and professional about their performances — including one such performance at DC’s City Winery recently.