During the 1950s and the first half of the 1960s, popular music was transformed in a number of ways and directions.  Despite the fact that this musicincreasingly lumped under the umbrella of rock and rollwas highly commercial, its development was deeply conditioned by, and in turn contributed to the growing social movements of the period.  Drawing mainly of the episodes of History of RockNRoll (1-6) that you need to watch, discuss what you think were the most important transformations of popular music in this era, and their relationship to the changing social climate.