Twenty-something virtuoso multi-instrumentalist, singer and arranger Jacob Collier has managed to outdo The Beatles by winning Grammy Awards for each of his first four albums. Alan Yentob meets Jacob and musicians he has collaborated with, including Stormzy, Chris Martin and film composer Hans Zimmer.  He also talks to music legends Quincy Jones and Herbie Hancock, who believe Jacob Collier is one of the most talented musicians on the planet today.