With five Grammy awards off the back of four albums spanning everything from folk to jazz and pop,

the British multi-instrumentalist Jacob Collier is a global phenomenon. But despite being feted by music royalty including Stormzy, Chris Martin and Herbie Hancock, the 28-year-old has kept a relatively low profile. Ammar Kalia takes a trip into Collier’s colourful, polyharmonic world of quarter-tones and non-standardised pitch.