Fiona Apple was wrestling with her dog, Mercy, the way a person might thrash, happily, in rough waves. Apple tugged on a purple toy as Mercy, a pit-bull-boxer mix, gripped it in her jaws, spinning Apple in circles. Worn out, they flopped onto two daybeds in the living room, in front of a TV that was always on. The first day that I visited, last July, it was set to MSNBC, which was airing a story about Jeffrey Epstein’s little black book.
These days, the singer-songwriter, who is forty-two, rarely leaves her tranquil house, in Venice Beach, other than to take early-morning walks on the beach with Mercy. Five years ago, Apple stopped going to Largo, the Los Angeles venue where, since the late nineties, she’d regularly performed her thorny,…