# Differences between the id3v2.3/4 standard and mp3tags implementation

**URL:** https://community.mp3tag.de/t/differences-between-the-id3v2-3-4-standard-and-mp3tags-implementation/68519
**Category:** Development
**Created:** [May 16, 2025, 6:29pm UTC](https://community.mp3tag.de/t/differences-between-the-id3v2-3-4-standard-and-mp3tags-implementation/68519 "2025-05-16T18:29:36Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Doug\_Mackie](https://community.mp3tag.de/user_avatar/community.mp3tag.de/doug_mackie/32/279_2.png) [@Doug\_Mackie](https://community.mp3tag.de/u/Doug_Mackie)
#### Post date: [May 16, 2025, 6:46pm UTC](https://community.mp3tag.de/t/differences-between-the-id3v2-3-4-standard-and-mp3tags-implementation/68519/2 "2025-05-16T18:46:57Z")

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On your point #1, please see here for an explanation:  
[Support for new iTunes Grouping id3 frame "GRP1"?](https://community.mp3tag.de/t/support-for-new-itunes-grouping-id3-frame-grp1/18523)

UPDATE: I suspect that your reference above to that [ID3.org](https://id3.org/Developer%20Information)  
page is out of date. The [Hydrogen Audio mapping tables](https://wiki.hydrogenaud.io/index.php?title=Tag_Mapping#Mapping_Tables) do list GRP1 for Id3v2.3/4. Scroll down to the row for "Content Group".

On your suggestion for a "Produced Notice" TPRO frame for id3v2.4, I'll let others comment.

I never use id3v2.4.

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