I recently became an all Mac girl so had to find substitutes for my wondows software. I used Mp3tag which I loved and after much serching I found this. Is simple, I can easily edit my podcast episodes and add all the info I need. Works great!
Tag Editor's interface is organized as an Excel-like spreadsheet, where each column represents an audio tag, a file or audio property. Tag Editor displays columns of two types:
Editable columns with audio tags, like Artist, Album, Artwork, and others. Those audio tags can be changed manually, downloaded from online databases and saved.
Read-only columns, which show file or audio properties, such as the Duration, Bit Rate, and others, are not editable and can be used for the creation of new tags and removing of lower quality duplicates.