The expectation upon seeing a banjo hanging is one of rollicking rowdiness, but when Kaia Kater began to strum her five-string, the mood in the office turned plaintive and a bit mournful. The Afro-Caribbean-Canadian singer and songwriter, who studied Appalachian music at West Virginia's Davis & Elkins College, often references the Black Lives Matter movement, within a music form that doesn't exactly snap to mind as being in dialogue with modern issues. These days, Kaia Kater records for Smithsonian Folkways, and some of the songs she brought to the Tiny Desk come from her recent recording Grenades, a record she worked on while exploring her father's home country of Grenada.