Add me to that list, I’m neither using nor liking iTunes. We three seem to be the perfect team discussing how this will be used by iTunes 
Unfortunately you cannot keep it out of the discussion, because Apple invented those non-standard ID3 tags (and their MP4 counterparts) for iTunes. Anyway, I will test this with iTunes. The only thing I really want to make sure is that whatever mapping we come up for ID3 is consistent with what we use for MP4.
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