They opened for Miles Davis and Sly Stone, then disappeared

This week's episode is a musical time machine. In the late 1960s, the band Zapata sprang out of a street gang in northwest Washington, D.C., with a sound that combined a variety of contemporary styles: Afro-Caribbean rhythms, soul jazz and the golden era of American R&B. The mixture worked. For a few years, Zapata opened for an astonishing number of A-list acts passing through the city, like Miles…