The Enlightenment produced numerous books, essays, inventions, scientific discoveries, laws, wars and revolutions. The American and French Revolutions were directly inspired by Enlightenment ideals and respectively marked the peak of its influence and the beginning of its decline.
The french helped tremendously with the american independence movement. They were still very bitter about the loss of the french and Indian war, and jumped at the opportunity to help defeat the British. After the war ended, France had its own revolution, which was inspired by and based off the american war for independence. A few american figures even helped out with the french revolution.
The common answer for this is that it is a joke. He was singing that because he was singing a few bars. This is a wordplay on the word bar of soap, and also on the fact that bars in music are <span>a segment of time corresponding to a specific number of </span><span>beats, so it's a pun actually.</span>
