The document traces the origins and evolution of breakdancing from its roots in the 1920s through several seminal styles and periods including the Cakewalk in the 1920s, the Lockers in the 1970s, the Electric Boogaloo in the late 1970s, Breaking in the early 1980s, and Krumping in the 2000s. The document lists over 20 citations from books and other sources on the history and culture of breakdancing and related dance forms.