‘Her fearless pursuit of capturing truth, even when it was grotesque, was a revelation’ – Fiona Apple’s Tidal turns 30

The New York artist was 18 when she released her debut album, in which she picked apart her experiences of trauma, anger, fear, isolation, heartache and self-loathing. Thirty years later, singer Sara Bareilles and critic Jenn Pelly tell Carsen Holaday how Apple helped change pop songwriting as we knew it