THE Audio File Tagger for OSX!
Yes, sounds like an exaggeration, but this little program really is well worth purchasing.
I had tried about half a dozen different programs (free and paid) and somehow they all missed some key feature or other. Metadatics is fast, intuitive, and does everything. It has some very useful features that I only found after using it for a few months: auto numbering lists of tracks; text manipulation (all caps, title case, etc); renaming files in the directory based on tag info, etc. You can add images to the files, and you can resize/downsample large files inside the program.
I have been using it for about a year. At first there were a couple of bugs, but the developers are very good at squashing them and pushing out updates.
I have been going through my 60+gigabytes of audio files, and this program has really sped up the process.
I heartily recommend it!
Johnners01 about
Metadatics