Sometimes music fans are eager to pigeonhole a band: These fans see musicians playing string band instruments and they figure, "OK, string band." In the case of Binghamton's Driftwood, they'd be right — but only to a certain extent. For all intents and purposes, Driftwood is a bluegrass band playing old-tyme instruments such as banjo, fiddle, and upright bass, but the sound is louder and more engaging than you might expect. And don't sweat it: There's a kind of rock aesthetic dealt out liberally, as an unrelenting fingerpicking style propels songs of both happiness and woe. It all swirls like smoke, with both lyrical sadness and hope.