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>
Answer:
Dr. Martin Luther King Jr. and John Lewis were willing to organize Civil Rights demonstrations despite the high risk of violence to themselves because they know that, the are the only one who can be able to unite the black community in US while pressing for the change the needed.
They are willing to be at the forefront of the protest inorder to encourage others of the need to join the growing community of blacks who are demanding the end to the segregations and other socila injustices in the US.
Explanation:
To reinforce America's stance as a global superpower as a force not to be reckoned with- as it was a huge show of force.