Douluo's Qin Emperor

Qin Yi traveled to Douluo Continent and awakened the most useless martial spirit in history - a thread. It dispersed when the wind blew and broke when pulled hard. The deacon of Wuhun Palace shook his head: "Not even as good as Blue Silver Grass." Everyone was laughing at him. Until he put this string on a piano he made and played the first chord in the world. Many years later, Pope Bibi Dong sat in front of him and listened to him finish playing "Guangling San", his hands were shaking. "When you play the piano... What can you see?" "Your life, Mr. Pope." This is a time-travel story about the unification of the continent while playing the piano.