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I would get rid of all those _Get subroutines, and hashes of hashes (makes no sense)

$TagInfo{bitrate}    = $m->audioProperties->bitrate();
$TagInfo{channels}   = $m->audioProperties->channels();
$TagInfo{comment}    = $m->tag()->comment()->toCString();
$TagInfo{genre}      = $m->tag()->genre()->toCString();
$TagInfo{length}     = $m->audioProperties->length();
$TagInfo{samplerate} = $m->audioProperties->sampleRate();
$TagInfo{track}      = $m->tag()->track();
$TagInfo{year}       = $m->tag()->year();
$TagInfo{artist}     = $m->tag()->artist()->toCString();
$TagInfo{title}      = $m->tag()->title()->toCString();
$TagInfo{album}      = $m->tag()->album()->toCString();

return \%TagInfo;
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Then I would stuff %TagInfo into a SQLite database, and run SQL queries against it.