Australian record producer, songwriter and singer Leah Haywood on breaking into the charts in 2001, singing backing vocals for Celine Dion, to writing and producing chart-toppers for artists including Selena Gomez, Demi Lovato, Nicki Minaj, Katy Perry, Justin Bieber and Blackpink. She reveals why last year saw her fulfil a lifelong dream and why she uses Genelec monitors in her studio.