Billie Eilish has all the reason in the world to scream – that’s why she whispers

Ever since her mesmeric, woozy breakout single ‘Ocean Eyes’ catapulted her to stardom at the age of 14, the alt-pop star has proven time and again that loud doesn’t always mean powerful. Now, dogged by incessant body shaming, dangerous stalkers and white-knuckle fame, she’s never been more quiet, says Nadine Smith