How to mass-organize iTunes library?

I'd like to try to organize the songs in my iTunes library (rename artists and albums, etc.), but my library's pretty large and it would be time consuming to manually edit my songs via the Get Info screen.

Is there a way to mass-organize your songs? Ideally by exporting your library's song info to Excel, and then importing it back into iTunes?

I've tried exporting a playlist as a .txt file, editing it in Microsoft Excel, resaving it as a .txt file, and importing it back into iTunes, but my changes had no effect.