The famous Tibetan singer Tsetan Drolma sang "Turn over the serfs and sing" (the theme song of the documentary "Tibet Today"), which contains the following lyrics: "The sun is shining brightly, and the eagle is spreading its wings. ...... Turn over the serfs and sing, the happy song spreads in all directions." What important historical event does this song reflect? What is its theme?
A: (1) In the early 1960s, Tibet triumphantly completed the democratic reform, abolished the feudal serfdom and embarked on the road of socialism.
(2) Theme: It glorifies the democratic reform in Tibet and expresses the joy of the Tibetan people in leading a happy and good life.