OS X 10.8 and later only. This applet checks your entire iTunes library for missing and presumed dead tracks--those tracks that iTunes is unable to associate with a file and which are listed in iTunes with a "!"--and can create a text file listing these tracks by last known File Path (if available), Song Name, Artist and Album, which you can view using TextEdit.
Also see Music Folder Files Not Added
To find and delete dead tracks see Super Remove Dead Tracks.
iTunes can't find the files pointed to by the Location property of these track entries.
Perhaps Also of Interest...
downloaded 1m 35s ago
Perform search-and-replace on text in your choice of tags
downloaded 10m 50s ago
Copy chosen tag info from one set of tracks to a different set of tracks
downloaded 11m 21s ago
Restore each selected track's artwork from an image file stored in its Album folder
downloaded 11m 37s ago
Applet assists with swapping, copying, appending data between track tags
downloaded 12m 34s ago
Check scripts downloaded to your computer from dougscripts.com for latest version
downloaded 16m 58s ago
Remove iTunes tracks disassociated from files