Guitarist Spencer Davis, bassist Muff Winwood, and Muff’s 14-year-old brother Steve Winwood on keyboards and vocals formed the Spencer Davis Group in 1963. The group had №1 hits in the UK with two songs by Jamaican-born Jackie Edwards: “Keep on Running” and “Somebody Help Me.” In 1966, manager Chris Blackwell decided the band had to write a song of their own.