The fourth volume of the anthology was never finished by Harry Smith. He managed to choose and sequence the tracks but never submitted liner notes to Folkways. Revenant Records released a version of this volume in the late 1990s with excellent liner notes and packaging. For the current release the Mississippi label have decided not to include any liner notes and conform the packaging to the same style as the first three volumes. This volume explores rhythmic changes that occurred in folk music between the late 1920s and early 1940s. Each volume is a double LP, housed in a cloth bound super thick cardboard gatefold sleeve with a tip on print on the front. The vinyl is 200 gram.