iTunes reload ID3 metadata I used an external program to mark the ID3 "BPM" metadata of 8,000 music files.  How can I get iTunes to reload metadata from those files?

Right now if I just begin playing a file it will recognize the new metadata, but there must be some way to force iTunes to do this in bulk.
Try breaking the ITL file &amp; make iTunes rebuild it.
Don't just throw it away, &amp; don't launch iTunes until there is a broken .itl file in place - that will not produce the desired result...

First, move the existing iTunes Library.itl to the desktop, just in case.
Don't touch the .xml, just the .itl file.

It can be found in ~/Music/iTunes/

Then… 


Delete the existing ITL if you left a copy in the iTunes folder.
Open Terminal &amp; enter this touch ~/Music/iTunes/iTunes\ Library.itl That will create an empty ITL file, broken enough for our purposes.
Launch iTunes. It will now notice something is 'wrong' &amp; start rebuilding the ITL file, using your existing XML file. The message is 'Importing ‘iTunes Music Library.xml’ This will take some time, maybe 15 minutes or so, depending on your Library size.


Breaking it rather than not having any .itl file there at all makes the difference between several minutes &amp; several hours for the rebuild, &amp; also how much playlist &amp; other metadata is successfully kept.

You may find some album artwork missing - it never seems to be a truly perfect solution, but your play counts, playlists etc should all survive intact.