Note: this application is not maintained. Provided without warranty of any kind.

Not available on the Mac App Store anymore. No other version can be downloaded at the moment

Squeed is a straightforward, efficient MP3, FLAC, AIFF, and M4A metadata (tag) editor with online database support.

Features

• Outputs clean tags: metadata that doesn't appear in the sidebar is not written to or kept in the file.
• Search on Discogs: search for an album or a track on the leading user-built online discography database and automatically populate metadata with that info, including cover art, all from within the app.
• Batch-process files: select several files at once and edit their tags or rename them in batches.
• Pattern renaming and tag extraction: batch-rename files with any combination of supported metadata or easily extract info from the filename.
• Preview audio inside the box: preview the currently selected audio files with Quick Look.
• Resize cover art: automatically upon adding, or manually on single and multiple files.
• iTunes integration: add files to your library and get autocomplete suggestions from iTunes metadata as you type.