Four Grammy awards, tens of millions of views, Quincy Jones as a manager, Herbie Hancock as a fan and Chris Martin as a collaborator: 25-year-old Jacob Collier has been compared to Mozart and Prince and called jazz's new messiah. The north London prodigy speaks to Eve Jackson from confinement about his four-volume, 50-song album "Djesse", being managed by the man who produced the best-selling album of all time, and what he's learned in lockdown.