This app does it all...

This is by far the best MP3 tag editor I have come across for both the Mac and Windows platform. It allows you to edit all tag elements for an individual song, or you can optionally apply one or more tag element changes to either all or some of the songs in your selection. It does a great job with finding album artwork, and it gives you several sources for finding and copying lyrics. Another great feature is the fact the you can have it rename the files (on the file system) based on tag elements, along with spaces, dots, dashes or however you want to format a file name. Plus, it is fast. GREAT app!

One feature request: A setting in preferences that allows you to suppress the confirmation dialog boxes that pop up after a tag edit or file change is saved.

mobi-dutch about Music Tag Editor