It'd be better if it were in the filename, and you provided a facility to match LRC and MP3 files that aren't necessarily named the same.
Do you mean something like matching these:
/lyrics/823A45F9-BelindaCarlisle-HeavenIsAPlaceOnEarth.lrc
/Music/80's/Belinda Carlisle - Heaven Is A Place On Earth.mp3
that shouldn't be hard.
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--The Amigo