this song could could be used because the original file could not be found

Hey there,
In order for iTunes to play a song, it searches for the song in its original imported location. Sadly, when the song is moved in terms of location, it doesn't update itself from iPod. One way to fix all of these at once is to consolidate your library. The first part of the article below provides step-by-step instructions on how to do this. Hope this helps.

http://support.apple.com/kb/HT1751

B-rock

That message usually means that the files have been moved from the iTunes music folder, or deleted from your computer entirely. Or the song files have been renamed/edited or otherwise changed by some method other than iTunes. In any event, iTunes has lost track of these song files.

When you say you "moved", I take it that means you moved house? Were any changes made to iTunes or the songs files when you moved your computer?

I found a solution for this here: http://techblogbydave.blogspot.com/2008/11/itunes-song-could-not-be-used-because .html

To repeat what is there, the problem is iTunes not finding the file(s) in the place it thinks they should be. This can happen for various reasons, including the files being moved or if you primarily use Windows Media Player and imported a playlist made with WMP.

Quit iTunes.
Locate your iTunes folder.
For Mac OS X the iTunes folder is stored in one of the following locations:
/Users/[your username]/Music
For Microsoft Windows XP and 2000 the iTunes folder is stored in:
\Documents and Settings\[your username]\My Documents\My Music\
For Microsoft Windows Vista the iTunes folder is stored in:
\Users\[your username]\Music\
Open your iTunes folder.
Drag the iTunes Music Library.xml to the Desktop

Now, open that file to edit it (in Windows, right-click and choose Edit, use Notepad). Look around and you will see that each song has something like this:
Location</key><string>

After that you will see the file's location. You can then use Notepad's Edit-Replace to fix drive letters or other paths. For example, I found that it had a relative path such as:

Location</key><string>../../Folderwithmusic/musicfile.mp3

Which was the location relative to the playlist I imported from WMP!

I replaced the "Location</key><string>../../" with the correct path:

Location</key><string> file://localhost/m:/Folderwithmusic/

(Where "m:" is the drive letter).

You aren't done. You have to delete the library file as well and then point iTunes back to the file you cleaned.


Mac OS X: "iTunes Library" (in versions of iTunes prior to 4.9 this was called "iTunes 4 Music Library")
Microsoft Windows: "iTunes Library.itl" (in versions of iTunes prior to 4.9 this was called "iTunes 4 Music Library.itl")
Open iTunes.
From the File menu, choose Library > Import Playlist.
Tip: Do not add any music into iTunes at this point.

Navigate to the iTunes Music Library.xml file on the Desktop.
Mac users: Click Choose.
Windows users: Click Open.
After re-creating your library, any devices that you sync with iTunes (Apple TV, iPod, etc) will see your iTunes library as a new library and will completely resync."

For steps to backup and restore playlists see "iTunes: How to backup and restore playlists. "

If your podcasts list in iTunes is empty after following these steps, see article HT2562.

If the iTunes Music Library.xml file is not available, follow the "Add to library" steps in "iTunes: About the Add to Library, Import, and Convert functions" to add files back to the Library (because the iTunes Music Library.xml file is not available, playlists and other information will not be available).