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The APEv2 tag was originally developed for the Monkey's Audio file format as a metadata container for such information as the title, artist, album, track number or other information about the file to be added to the file itself (See APEv2 spec (http://www.personal.uni-jena.de/~pfk/mpp/sv8/apetag.html) or cached APEv2 spec (http://www.ikol.dk/~jan/musepack/klemm/www.personal.uni-jena.de/~pfk/mpp/sv8/apetag.html)) but has emerged as an alternative to ID3 tags also for MP3 files.
Developers mainly endorse APEv2 because the ID3v2 tag is very rule based and very difficult as the changes in each minor revision are very large and usually contradictory so that a ID3v2.2 supported player will not correctly read a ID3v2.3 etc. APEv2 provide more flexibilty and is rising in popularity, mainly thanks to the foobar2000 media player.
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