New Zealand singer-songwriter Lorde is already one of the world’s most popular musicians. Now she’s part of the world’s most popular movie, too. Lorde’s song, “Yellow Flicker Beat,” plays during “The Hunger Games: Mockingjay Part 1,” which opened in November with the highest opening-weekend earnings of 2014. Lorde performed the song for the first time on TV that same weekend at the American Music Awards.