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>
To prevent the spread of communism to the south Vietnam
The Goal of Great Leap Forward (1958-1961) was to quickly modernize China, and specifically to change it from an agricultural land to an industrialized one. One of the other answers could confuse but it's false :e<em>liminate traditional Chinese culture </em>refers to another great event under Mao: the Cultural Revolution (1966).
