The song [and images] were inspired by one of the drawings of a chimney sweep created by Mary Poppins’ screenwriter, Don DaGradi. When asked about the drawing by the Sherman Brothers, DaGradi explained the ancient British folklore attributed to “sweeps” and how shaking hands with one could bring a person good luck. In their 1961 treatment, the Sherman Brothers had already amalgamated many of the P.L. Travers characters in the creation of “Bert”. His theme music became “Chim Chim Cher-ee”.