You're not the only one asking
[link|http://amarok.kde.org/blog/archives/51-Meta-Information,-Track-Infomation,-Tags.html#c527| ... does not read and write MP4 tags (because there is no formal description of these, Apple has never released anything official on the subject)]
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Purveyor of Doc Hope's [link|http://DocHope.com|fresh-baked dog biscuits and pet treats].
[link|http://DocHope.com|http://DocHope.com]