On Kendrick Lamar and SZA’s hit collab “Luther,” off Lamar’s album GNX, a sample of Luther Vandross intones, “If this world were mine,” over and over. But for Lamar and SZA, that’s no longer an “if.” ...

Lady Gaga will headline Coachella once again, coming back to the Empire Polo Club in Indio, California, on Friday night.