How to rename bulk title tag in mp3 ID3 files
If you already have the proper track numbers you can try a hack with EasyTAG: first, rename the files to include the track number then read the track number into the title field by treating it as an element of the title.
In particular: use the renaming pattern Track %n
and then read back using the pattern %t
.
Back up your files before experimenting with this solution!