Don't use it myself, but I agree that bottom table looks pretty confusing.
My quick suggestions:
1. Put the filename on the left (it uniquely identifies each file and helps left-to-right reading order as in "For this file, this is what will happen...").
2. Make the distinction between "This is what your tags
are" and "This is what your tags
will be" more obvious. Maybe two separate tables side-by-side with headings "Current tags" and "Suggested tags from source"?
3. Time as a column is confusing too. It can't be edited by the user and I assume is there to make sure the album selected at the top is actually the correct release for your files.
Bee excellent to each other...