There is such a lyric in "Turn Over the Serfs to Sing" (the theme song of the documentary "Tibet Today") first sung by the famous Tibetan singer Cai Danzhuoma: "The sun is shining, the eagle spreads its wings and flies. ..... turn over serfs and spread the song of happiness everywhere. " What important historical events does this song reflect? What is its theme?
A: (1) In the early 1960s, Tibet successfully completed the democratic reform, abolished the feudal serfdom and embarked on the socialist road.
(2) Theme: Praise the democratic reform in Tibet, and express the joy of living a happy and beautiful life in people in Xizang.