OS X 10.8 or later. Assists with segregating iTunes Match tracks that appear to get cut-off when played (due to a possible bug, described here). Then these truncated tracks can be deleted and re-downloaded intact (by you, not the script).
Open the single selected track in in QTP7 and open QT's A/V Control window
Two scripts copy text from the clipboard to current or to selected track's lyrics
Renumber order of selected tracks
Display, create text file listing info of dead tracks
Remove iTunes tracks disassociated from files
Locates pairs of track entries pointing to the same file