ID3 Tag Finder And Converter?

[dood gone krazee]

I just recently got an iPod Classic and want to put my whole music library into it, including all songs I have from Stepmania. I have all the MP3's already in my iTunes library, but since stepfile artists are lazy and label a lot of their msuic files as things like "lol" or "msm+smm" or "that mario song," I have a bunch of songs without the real name. Here's where I need an ID3 Tag Finder and Converter program of some sort. Not only do I want to change the titles of the song, but I also want to find artist names (some are missing them) and possibly album names. The only thing iTunes can do is to type everything in manually, and I REALLY don't want to find and type info on 2000+ songs. Does anyone know a program that can take a mass of songs, find the title/artist/anything else and then replace them?