[ubuntu] Find duplicate music files in different formats

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http://ubuntuforums.org – Hi, I have let my music collection get into a bit of a mess. I have a large collection of FLAC files which also have an MP3 duplicate for syncing with a sn MP3 player. I now wish to remove these duplicates. Any idea how to go about it without going into each folder indiviually? i can't simply search for .mp3 and delete as there are some albums i only have MP3 copies of. Thanks, (Hardware)