By 1966 George Harrison had been in a group (with various names) with Lennon and McCartney for 8 years, their songwriting partnership had been actively writing

By 1966 George Harrison had been in a group (with various names) with Lennon and McCartney for 8 years, their songwriting partnership had been actively writing songs for 5 or 6 years, they had written almost all the songs for 6 or 7 albums, several of which are regarded as among the best albums of all time.