The purpose of this series is to introduce the improvisational idiom associated with jazz of the 1920s and 30s. Despite the stylistic changes that occurred as Hot Jazz developed into Swing, the examples provided demonstrate an underlying unity of approach to the melodic interpretation of harmony, and one which continued within Boogie Woogie,  R&B, Rock ‘n Roll, Skiffle and Country music, even if modern jazz took a different route.