Kacey Musgraves bent country tradition to her will, writing songs that evoked the sound of classic country but were infused with progressive ideas reflecting her millennial perspective. "Merry Go Round" and "Follow Your Arrow," the big singles from 2013's Same Trailer Different Park, crystallized this gift and established Musgraves as a major voice in country music: she was the rare country singer who could cross over to a rock audience without playing pop. By the end of the decade, she expanded her musical horizons so they mirrored her expansive lyrical stance, a shift showca...