Leo played a big role in introducing blacks to a wider white audience (Chess). He signed multiple successful artist but some of the main ones were Chuck Berry, Muddy Waters, and Etta James (Chess). Leo and Phil helped turn blues into rock&roll making a great change(Chess).Their records made a major change in American culture during the 50s(Chess). Chess had a series of blues, r&b, and rock and roll increasing the music charts with great music and a grater variety of black artists (Chess).