Country-western and pop-inflected rock and roll duo Widowspeak has purveyed its hazy, swampy twang since 2010. Members of the Captured Tracks roster, Molly Hamilton and Robert Earl Thomas aka Widowspeak have only just begun, and they already have two impressive full-lengths under their hip-slung, worn leather belt. Their upcoming EP, The Swamps, drops on Oct. 29, and its singles, candy-colored “Calico” and echo-laden “True Believer,” bode well for Widowspeak’s expansive, transcendent sound and body of work. Witness Widowspeak at Low Spirits (2823 Second Street NW) on Sunday, Oct. 13, along with self-described “new age/slow dance/adult contemporary/spiritual” group Pure Bathing Culture. This 21-and-over show swoons to life at 8pm, and admission is $8.