A DJ goes crate digging unearths a trove of rare Indigenous music folk, rock and country music. The re-issue Native North America Volume 1 turns the spotlight back on trailblazing musicians from across the continent. But it also raises questions about when music is considered art and when it becomes an artifact.   This episode featured contributions by Maya-Roisin Slater and Katie Jensen.   For more information, go to canadalandshow.com/imp