dupeGuru ME (Music Edition) supports most popular audio file formats, including MP3, OGG, and both traditional and lossless AAC and WMA (notably absent is FLAC, unfortunately.) Once installed, point the app at the folder where your music lives, and tell it to match dupes by filename, tags, file content, or audio content (audio fingerprint.) The app also supports complex search filters, and lets you add regular expressions or other logic to make sure you catch everything you're looking for.
When dupeGuru finds duplicates, it presents them to you to decide what to do with them. You can delete it immediately, move it elsewhere for further review, or even play the file right there to test it. If your music library is big enough that using your favorite player's "find duplicates" feature just isn't cutting it anymore, dupeGuru ME may be worth a look.
dupeGuru Music Edition | Hardcoded Software via Addictive Tips
You can reach Alan Henry, the author of this post, at alan@lifehacker.com, or better yet, follow him on Twitter or Google+.
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