Literature Reference: Revering the great emperor, we look up to the vast heavens. The first command lights the fields, and the suburban palace is opened. The sound of Yunmen startles the ears, and the thunder drums echo in the sky. The gods are worshipped, and the glorious fortune is thus harmonized. Source from 'Suburban Temple Songs: Sacrifice to the Circular Mound, Yonghe' by Chu Liang.