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Audio files usually have metadata embedded in them, even if the file name is useless. The last time I had any cause to care about this, the term was 'ID3 tag', and you could find free programs to read and edit ID3 information.
It's probably worth checking if they do have metadata on them, since more than renaming the files, adding/correcting metadata is what would be useful -- it's pretty straightforward to mass process files to change filenames based on ID3 information, and it's also the same information which iTunes, etc, will use to sort them.
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