In a class about galactic history, almost everyone was an alien... Actually, that's not quite right to say, as everyone there was an alien. Li Hao initially assumed that such a class would not draw a large crowd, but he was mistaken. Many who hailed from advanced civilizations were just coasting along, quite a number of them from well-born Sky People did not need to go into battle. Being a holy song warrior was indeed glorious and influential, yet inherently fraught with danger. For them, just possessing the status of a holy song warrior was more than enough.
Galactic History could enable Li Hao to gain a more thorough understanding of the Sky People and the origin of the Galactic civilization. Of course, this history had been tweaked and so should be taken as a reference only.