Brandi Carlile can hold the weight of the world in one single note—and that puts quite a lot of pressure on the stars of her videos. Along with bringing us to the stage for some high-spirited performances and unplugged sets, the Americana powerhouse has invited artists and actors like Kris Kristofferson, Elisabeth Moss and Sam Smith to help channel all that emotion brimming in her voice through poignantly intimate vignettes.