A rock band without a drummer, a bluegrass band without a fiddler. To the gentlemen of the Dead South, a self-styled 4-piece string band from Regina, Saskatchewan, it’s about how, not what, you play. Their sound, built on a taut configuration of cello, mandolin, banjo and guitar, speeds like a train past polite definitions of acoustic music into the grittier, rowdier spaces of the bluegrass world.