Changed Tag Song Name from title to artist - undo?

Support
1

I mistakenly changed the song tag name to the artist's name. Can this be undone on hundreds of songs?

2

That depends if all the data can still be seen somewhere.
Best would be a screenshot of the extended tags dialogue of a single file.

3

Single song edit will take days

4

I do have all the song titles for the songs in a folder

5

Does that mean that the filename has data for the field TITLE?
A screenshot of the extended tags dialogue Alt-T for a single file would show such sources and the target fields.