I second Tag&Rename. I obsessively tagged my 6000+ songs and got almost all the info from allmusic.com. I'm still not sure just why I took the time to put the years in to every album, but I did.

And it only took me a year and a half!
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set