From DC Larson, in Counterpunch.
Rock'n'roll was born from a multiplicity of racial and cultural idioms including r&b, hillbilly country, blues, bluegrass and gospel. Proudly embracing that taboo diversity, it thrust its middle finger into the aghast mug of stilted, button-down propriety. (I speak here of the raw, original item, and not subsequent, commercially-cultivated replicas.)
It acted as a socially-unifying component of the growing Civil Rights movement, and brought people together on the dance floor just as others would unite at polling places.
Not to paint too rosy a picture. It wasn't the entire solution but it did help spark the crucial process. And its service in helping to usher away racial segregation should not be forgotten.