title: How can I change metadata in mp3
body: <p>I would like to add metadata to mp3 files in C/Objective-C (OS X).
  I found several libraries (e.g. id3lib), but I have no clue on how to compile them.
  Are there any tutorials on how you can do that? Is there any other framework for C/Objective-C to write ID3 tags to an MP3 file (song name, artist and coverart)?</p>