TagTunes is an application that uses Apple's Search API to get tags for your music files direcly from the iTunes store. With TagTunes you can easily clean your music library using exactly the tags that Apple itself uses.
Some random questions and answers
How do I install TagTunes?
To install TagTunes download the disk image and mount it by double-clicking it in the Finder. Then drag the TagTunes icon to any folder you like and run it.
How does TagTunes work?
TagTunes uses Apple's Search API to get its tags.
The tags I got from TagTunes differ from the one's in the iTunes Store.
Unfortunately Apple's Search API does not always return the name results as the iTunes Store does. This mainly affects composers (which aren't returned by the Search API at all) and track titles.
Does TagTunes support other sources than the Search API?
No, currently TagTunes does not support other sources.
Can I contribute to TagTunes?
Please E-Mail me at dev.kwittenburg@icloud.com
A note to developers
Currently TagTunes is not released under a open source license. This will most likely change in the future, though. Until then you can freely browse the source code. If you want to incorporate this project in your own, please write me at dev.kwittenburg@icloud.com.