# Non-standard ID3v2 frames: TPAK, TBPR, TENM

**URL:** <https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041>\
**Category:** General Discussion\
**Created:** [November 7, 2026, 12:25am UTC](https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041 "2026-11-07T00:25:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kswartz](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/k/f9ae1b/32.png) [@kswartz](https://community.mp3tag.de/u/kswartz)\
**Post date:** [November 7, 2026, 12:25am UTC](https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041/1 "2026-11-07T00:25:27Z")

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I've been doing some rigorous cleanup of my MP3 collection, and I've come across some files with non-standard ID3v2 frames:

- TPAK
- TBPR
- TENM

I suspect these were introduced into my files by iTunes, as the TENM frame is set to the value "iTunes 12.10.6.2". (And then it also pollutes my COMM field with iTunNORM and iTunSMPB values.) Can anyone confirm if these do, in fact, come from iTunes?

If TENM is just some "iTunes wuz hre" marker, I'm guessing TBPR is BPM because it almost always matches what I have in TBPM from another program (except that TBPR is always an integer). But does anyone know what TPAK is supposed to be?

FWIW, I have no interest in using these tags, and I'll probably just remove them. But I'm building some code around ID3v2 tag cleanup and organization, and if I decide to open source it at some future date, I'm curious to know if anyone else would ever have a reason to keep them around.

TIA,

Keith

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**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\
**Post date:** [November 7, 2026, 7:30am UTC](https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041/2 "2026-11-07T07:30:00Z")

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I haven't encountered TPAK, TBPR, and TENM yet. If TENM has the encoder, it's probably something like TENC. What are the values in TPAK?

But iTunNORM and iTunSMPB are related and used by iTunes/Apple Music for normalization and gapless playback.

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<div class="post-metadata">

**Author:** ![kswartz](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/k/f9ae1b/32.png) [@kswartz](https://community.mp3tag.de/u/kswartz)\
**Post date:** [November 7, 2026, 7:16pm UTC](https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041/3 "2026-11-07T19:16:27Z")

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In every instance I can find, TPAK is just set to the value 1. So it's likely a boolean for something.

Makes sense that TENM is the encoder. Apple seems to be taking existing tags (TENC, TBPM) and tweaking the last letter ever so slightly to make their own rather than reuse what's there. Absolutely bizarre.

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<div class="post-metadata">

**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\
**Post date:** [November 7, 2026, 7:29pm UTC](https://community.mp3tag.de/t/non-standard-id3v2-frames-tpak-tbpr-tenm/72041/4 "2026-11-07T19:29:50Z")

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> [@kswartz](#):
>
> TPAK is just set to the value 1. So it's likely a boolean for something

Or the disc number, TPOS

> **[DISCNUMBER - Tag Field Mappings – Mp3tag Documentation](https://docs.mp3tag.de/mapping/#discnumber)**
>
> The list below gives an overview of all tag fields available in Mp3tag, their names to be used in Mp3tag, and how they are mapped to the internal structures of the different tag formats. | Overview of all available tag fields, their names in Mp3tag,...