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Why do some songs have two or more original singers?

The original singer can only be one person. The example you gave is incorrect.

The original song of Notepad is Kelly Chen, and this song was written by Steve Chou.

Persistence is the original singer, and Tian Zhen and Xu Wei are the songwriters.

At least you, Sandy Lam is the original singer and the cowboy is the cover.

You look like Tayu Lo is the original singer and songwriter. Terry Lin turned over.

The real hero is the chorus.

As soon as I cut the plum, I remembered that the original song belonged to Yu-Ching Fei.

I can only point out these. All the other songs are new songs. I don't know.