I searched for "mp3 tag" in http://search.cpan.org/.
This produced a lot of results, many of which may be suitable for you.
I didn't really spend any time investigating this further; however, the first result, "MP3::Tag - Module for reading tags of MP3 audio files", looks like a good starting point.
[When you're looking for a Perl module, http://search.cpan.org/ is often a better first choice than a general-purpose search engine.]
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