It was a tall order in the post–Lil Nas X era, but she got to it. After working with musicians from a range of kinds and wardrobes—Rosalía, Billie Eilish, Mark Ronson, Sia, Kesha, Poppy, and more—Burkhart has an expansive inventive grammar for particular, blue-sky requests. Brand Elder Statesman to assist with the tie-dying; the Austin…