since 1997 

Hi everyone. If you’ve recently accidentally fucked and then re-fucked (during the process of initial un-fucking) your music library (or similarly massively large set of important media files), here are some fun tools to help you get back on track:

http://sourceforge.net/projects/swissfileknife/ – Swiss File Knife has many, many, many options and utilities (most of which work in windows -.-) to find duplicate files, or originals, and process them accordingly with internal or external command chaining.

https://en.wikipedia.org/wiki/Bourne_shell – the Bourne shell is a new-ish (like in the last 20 years) scripting shell, which has become the de facto standard in Linux and Mac OS X

https://en.wikipedia.org/wiki/Grep – possibly the most useful Unix command-line tool ever made, grep allows you to do processing on any kind of data you can pipe to it, with a variety of regular expression and other pattern matching tools.

http://www.jedit.org/ – JEdit, the programmer’s editor, is a fantastic cross-platform text editor with syntax highlighting for 46 octillian languages, vertical block selection, regex find/replace for selection, buffer(s), in files/directories, etc. etc. You can do fucking anything with it. But it’s not emacs.

http://www.fadingred.com/senuti/ – Senuti is a Mac utility to recover music files from your iPod, iPad or iPhone – so you if you lose your library, you can get them off the device you just ‘synced’ your library too.
   The trial version only lets you retrieve 1000 songs at a time, but luckily all you need to do to get around this restriction is:
1. Run Senuti, and recover 1000 files
2. Note where you were in your list of songs
3. Delete everything in ~/Library/Application Support and ~/Library/Preferences related to senuti
4. Run the Senuti installer again, and re-install it
5. Goto 1.

http://www.tunesify.com/ – Tunesify is the ultimate music converter for Mac (which isn’t a $500 faux pro-audio tool), allowing you to easily convert between MP3, Apple Lossless, FLAC, AAC and many more flavours of non-DRM bullshit digital music formats which are a waste of time. :D!!!
   I bought it for *real money*, and now my life is wonderful and I drive to work in a Mercedes that gives me a blowjob while I drive. BUY THIS PRODUCT!

With the above tools, several years experience with basic unix scripting, a strong coffee, and about 5hours of the sort of hell the likes of which can only be found on the other side of the wormhole in Event Horizon, you can easily rebuild your library from several sources of ragged, incomplete, partially corrupted or duplicate-filled clades, add and auto-re-organise them in iTunes, and have a steaming hot pile of gold music at your fingertips again — ready to be accidentally deleted, corrupted, or not backed up ever at your convenience :D