SHouSHa, i've found from yahoo some sites that might help you.
.LRC lyrics database:
Here and
Here.
This is a program that you install and search the internet for lrc lyrics
Here.
And finally, this is a program that allows you to edit the lrc lyrics
Here.
i've never used the lrc function before and i personally find it no point to. But you can find more information about it by searching for "LRC Lyrics" via search engines.
Hope this helps