Doubt, followed by discovery. Demos that ended up as finished tracks. New beginnings, rear-view reflections, and ruminations on the fluidity of time: Great Lake Swimmers’ eighth album, “Uncertain Country,” captures these feelings and so much more. Even before the world turned upside down, singer-songwriter Tony Dekker felt mired in uncertainty: from the climate crisis and the ever-changing political landscape to deep shifts within the music industry. The “uncertain country” Dekker chose as the album’s theme is not a specific place. Rather, it’s a territory we, as humans, inhabit in the 21st century — a world that, more often than not, is confusing, unfamiliar and unsettling.