Technique for tagging classical music for itunes using grouping and movements for proper shuffling

[esumsea]

@ohrenkino

Do I continue to use the %work% field for work

%work% cannot be found in the list of standard fields - so it is most likely a user-defined field that will read only by very few players.

the field CONTENTGROUP is the MP3tag field that gets displayed as Work in iTunes. No mapping required.

Thanks again ohrenkino!
I am confused as I see WORK (%work%) in Tag fields exclusive to MP4 in Tag Field Mappings – Mp3tag Documentation

Since the only field mapping I did was the one above for ID3v2, do I have to do additional mapping or will I be fine with both MP4 and ID3v2 if I just use CONTENTGROUP (%contentgroup%) for work title?