OS X 10.8 and later only. This script 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 alleged 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.
See the video on YouTube.
iTunes can't find the files pointed to by the Location property of these track entries.
Set the Plays of selected tracks.
Two scripts copy text from clipboard to current or single selected track's lyrics tag
Copy track number prefixes to track number tags
Delete and trash tracks from iTunes whose play counts are 0
Displays files in iTunes Media folder not in iTunes track library
Convert selected tracks and export the converted files to a new folder