It is June 2022, and Joni Mitchell is in a playback studio in Los Angeles, listening to her most successful album, Court And Spark, being radically reborn. “I love the sound of my voice,” she tells Ken Caillat, the engineer overseeing new Dolby Atmos mixes of four albums Mitchell released between 1972 and 1976, rendering them as an immersive sound experience. “I can’t believe how good my voice sounds!” Aged 78, and still recovering from the effects of the aneurysm she suffered in 2015, she is sufficiently moved to start dancing. “She was thrilled,” Caillat tells Uncut. “And we were thrilled that she was thrilled.”