On “What Was I Made For?”, her contribution to the Barbie soundtrack, Billie Eilish contemplates life in plastic. “Taking a drive/I was an ideal/Looked so alive/Turns out I'm not real/Just something you paid for/What was I made for?” she reflects, channeling the titular doll as she moves between worlds. If you’ve seen the trailer for the Greta Gerwig-directed film, you’ll know that it’s more than just a breezy ride in a hot-pink Corvette—it's an irreverent take on a complicated pop-cultural icon, and Eilish matches that depth with a poignant ballad. “I don't know how to feel, but I wanna try,” she sings. “I don't know how to feel, but someday I might.”