What should I use to organize my iTunes music?

My music collection is nice and organized. Each album has it’s own folder, each album organized either by the artist, or by the genre (depending)

Does iTunes care for any of that? Nope. Hence my problem. Some of my music is old, so it doesn’t exactly have all the internal data such as album name or artist label that iTunes uses. Doesn’t help that I may have one or two duplicate folders here or there, and that iTunes has it’s own system of organizing by albums or artist (it completely destroyed Pendulum album, each and EVERY song is under a different artist, all named Pendulum, and since it counts it as different artists, I now have 12 albums of In Silico, all with one song)

I’ve been searching online for an automatic iTunes organizer and I’ve already found a few, but I thought I’d ask the collective if they have any they’d recommend.