sentences:  The parent dance "Chicago Bop" may have been more Eastern Swing, but Steppin' has characteristics more similar to Western, especially its usage of a lane or slot.The term "Bop" was used to describe the dance form by Chicagoans until the early 1970s.Prior to that time "Bop" was a universally known term with its origin beginning sometime between 1945 & 1950 to express music and dance.