Like a lot of young British movie fans of my age, the deceptively cheerful piano melody of this song first came to my attention in the 1970s as the theme music to the BBC’s long-running Film Review series (Film 1972, Film 1973 etc etc…) and it was nearly twenty years before I learned that this jolly jazz-gospel piano tune was in fact one of the key cultural touchstones of the American Civil Rights movement.