Grace VanderWaal is no longer the bright-eyed, ukulele-playing 12-year-old you remember from America’s Got Talent. Now 17, the singer is back with “Repeat,” a bold and lively track in which she channels her inner rock star. It’s a short, joyous romp that revels in its unpredictability and eccentricity, with VanderWaal’s husky, snarling vocals bolstered by a thumping backbeat and heavy bassline. Energetic and even chaotic, it packs a fierce punch and offers no apologies, leaving you dazed and ready for round two. —Emlyn Travis
