Tributes pour in for 'musical genius' George Martin

George Martin has been described as "visionary" and "a musical genius" as tributes flooded in following his death at 90.

Sean Ono Lennon, son of John and Yoko, posted a picture of George on Instagram with the caption: "R.I.P. George Martin. I'm so gutted I don't have many words. Thinking of Judy and Giles and family. Love Always, Sean."