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 2m 37s ago
Assists with tagging and adding PDF files to iTunes
downloaded 4m 40s ago
Resample selected tracks' artwork to user-set size limit
downloaded 9m 48s ago
Copy chosen tag info from one set of tracks to a different set of tracks
downloaded 12m 9s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 12m 36s ago
Removes leading and trailing space characters from chosen tags in selected tracks
downloaded 13m 3s ago
Gather audio tracks whose files contain no artwork metadata