Watch Courtney Barnett's Lovely Cover of Leonard Cohen's "So Long, Marianne"

One chill way to start your weekend is by sinking into Courtney Barnett's new MTV Unplugged set. The Aussie singer-songwriter performed selections from throughout her career and covered Archie Roach's "Charcoal Lane" and Seeker Lover Keeper's "Not Only I." What's hitting me hardest, though, is Barnett's rusty rendition of Leonard Cohen's "So Long, Marianne," backed…