This course will trace the development of Rock and Roll during the 20th Cnetury into the 21st. The principal content starts with the precursors to Rock and Roll in music of the 1920s, 30s, and 40s, as well as the distinct influences that racially-segregated America had on the early stages of R&R in the 1950s. After discussing the emergence of R&R in the 1950s and the early stylistic trends, much attention will be played on the explosion of styles and subgenres in the 1960s. This will create several threads that carry the course through the remainder of the century into a view of the present day.