Change the case of the selected iTunes track names to "sentence case": all lowercase with the initial letter uppercase. For example, "L'effet Que Tu Me Fais" could become "L'effet que tu me fais", and "Comme D'Habitude" becomes "Comme d'habitude". This is customary in many languages.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
Append the BPM to the beginning or ending of the Song Name of selected tracks
Re-locate files of selected tracks to new folder, preserve track meta-data
Perform search-and-replace on text in your choice of tags
Sort purchased tracks into discrete playlists by name or account ID
Append user-entered text to beginning or ending of selected tag of each selected track
App displays files in iTunes Media folder which are not in iTunes library