Alternate CD matrix/runout inscriptions: enough for a new release?

The definition of a release seems a bit unclear.
@Zas mentioned the guidelines in his notes. Are these meant?

Reading it, a release seems to be defined by its properties. Cover art isn’t mentioned (and details such as manufacturer).
Release Group style says re-issues should grouped together. How does MusicBrainz define re-issues?

The editing FAQ didn’t help much either:

There are releases with no cover art or even wrong covers! Can I change them?

Please make sure that you have selected the correct release, of course. Check the barcode and catalog number; if they don’t match your release, you probably are looking in the wrong place.

There are two or more releases with the same titles, should I merge them?
Releases should only be merged when the following requirements are met:

  • The number of tracks are the same
  • The track titles are the same
  • The track lengths are the same (or extremely close if the release has no discID).
  • The country, label, barcode, format, and packaging, are the same
  • The cover art is the same.

The release dates, publishers, and distributors should probably also be the same to warrant a merge.

I found the same release twice. Which one should I remove?

Probably neither. If they are really identical (exactly the same tracks in the same order, same label, catalog number, and release country), you should merge the albums. This helps other users > update their tags, and also allows voters to check that it really is a duplicate.

An interesting bit in “How to add cover art”:

There is also a field for adding a short comment if you want to specify something about the image (like “misprinted first pressing”).

Cover Art doc says:

Cover art, also known as “album art” or “album artwork”, is artwork that provides a visual representation of a release. Normally it refers to the front of the release packaging, but the Cover Art Archive can store images of the back of the release packing, of the media itself, and of many other pieces — right down to the sticker on the shrinkwrap.

So, a release merge requires among others same cover art, publisher and distributor but not manufacturer.

But what exactly is part of a release?
I couldn’t find a distinct definition on MusicBrainz.

Has MusicBrainz adopted certain guidelines from Discogs?

I’ve canceled the controversial open edits.


This is exactly the kind of question I like to see. :slight_smile:


If you’re looking for an all-encompassing description document that nails down every fringe case of exactly when something does and does not constitute a new release, not only does that not exist (and shouldn’t imo), because:[quote=“Zas, post:24, topic:79829”]
whether this difference is important is very subjective.[/quote]
Everyone has a different use case, and setting in stone whose needs and wants are more important than other peoples is a bad idea - particularly when we don’t currently have a problem with having ‘too many’ releases or ‘too specific’ releases.

Hopefully we can all live with creating a new release when another editor would prefer it, even if it is a minimal change that we don’t personally need to see differentiated. And hopefully other people will repay us the favour in future.

Even if we did create a doc I would want it written, in bold at the top:
merging is easier than untangling, when in doubt, make a new release and annotate and disambiguate

That said, if anyone can find a better way of doing the style guidelines/docs in a better way without making them over complicated and verbose, yes please!! :slight_smile:


Well, i think Discogs definition of a release is very near of MusicBrainz’s one in practice. But MusicBrainz doesn’t define it as clearly for now.

Important points in Discogs definition is:

1.4.4. Manufacturing variations should not be counted as a unique release. For example; different stampers / matrix numbers for the same edition, manufacturing tolerance based variations in the shades of label paper or ink color, or unintended vinyl coloration caused by variation in vinyl stock, etc., would not constitute a unique release.

And the notion of “same edition” is perhaps what is lacking in this discussion.

So basically, i don’t know if MusicBrainz officially adopted certain Discogs guidelines, but for sure, in practice, many editors did. Perhaps just because it makes sense, and because many MB editors are also Discogs editors (which isn’t my case).

The fact is Discogs is one of the best sources when it comes to list different editions of an album, and often MusicBrainz is usually far behind in number of releases (not that quantity = quality, but when you have only 10 releases over 250+ editions i would say quality isn’t there either).

@reosarevok: time to improve official guidelines about what is a release or not for MusicBrainz ?


If someone suggests some good wording, I’m happy to look at it :slight_smile:

1 Like

I think Discogs’ approach is very sensible. And while having more releases doesn’t degrade the data quality, it could add confusion, especially because MB’s interface isn’t very good at displaying lots of information in a way that makes differences clear. So I’m not really in favour of having a different release for every matrix number or run-out code. I am of course, very much in favour of the “if in doubt make a different entity because merging later is easier than untangling” rule of thumb.

Here’s a little draft of what an updated guideline or FAQ could be like:


Thanks for your answers everyone.

I’m sorry for making such a fuss. These edits were a very premature optimization of mine.

I should’ve sticked to a consistent workflow. That is, uploading cover art to a (perfectly) matching release else creating a new one.

I have many more scans in queue, watch my collection.:relaxed:


When full scanned cover art of one of the candidates isn’t avalaible, you can’t compare.
Creating a new release, with full cover art & matrix numbers (in annotation and/or cover art) is the safest way.
Merging will eventually occur when both releases have full infos, scans of the CDs (for example) can then reflect the different possible matrix runouts for the same release.

I wish we had fields to store matrix runouts data instead of using annotation (may be,


Thanks so much for all the work, scans are the best!!


I think that is covered by my third point, though I think it could be more prominent.

Any news on this? Is there a ticket for it, or did it get into the official documentation?

To be honest I barely remember writing that post. :slight_smile:

I think I was hoping further discussion would lead to an official proposal, but as you can see that never really happened.

Thanks for the info!

  • In my opinion, we should definitely have some sharpening of the official guidelines telling us when two releases should be considered the same and when not. (There will always be corner cases, but it shouldn’t be hard to significantly improve the current situation.)
  • I don’t see a reason why not to follow the discogs definition. First, it feels quite reasonable to me, and second, we should not break inter-database compatibility to discogs without a good reason.
  • In a nutshell, I fully support the suggestion of mfeulenbelt.

@reosarevok What do you think? Shoudn’t we make something official out of this?

As @zas mentioned these:

  • annotation is the most appropriate place for matrix/runout for now until it fits into other fields,
  • scans of medium’s inner ring are welcome additions to cover art as proofs for further reviews.

Note that medium will soon have new attributes dedicated to SPARS code, mastering SID code, mould SID code, and matrix/runout numbers. This is a current top priority development, watch MBS-8393 for updates. When these attributes become available, existing identification codes in annotations will just have to be moved to the corresponding medium attributes.


I think differentiating different releases by matrix numbers is inevitable. Matrix numbers tell us about who manufactured a medium and when (by indicating the nth pressing). So even if we don’t use matrix numbers for differentiation, two releases with identical artwork, barcode, etc. will have different manufactured by or possibly manufactured in relationships. The start and end dates will further indicate the pressing of a release, further differentiating releases from the same manufacturing plant.

In most cases we will not know when a certain pressing is manufactured, but not knowing does not mean that information doesn’t exist. So the real question is, should MusicBrainz ignore certain types of information? Should the information we collect and organize be limited by our layout, or should it be the other way around, where the layout is designed to fit the data we want collect?


Sometimes CDs get remastered, but everything else (catalogue number, packaging etc.) remains the same. We can tell them apart using the disc IDs. The matrix number can be another way to identify one particular mastering, so it has its use. I’d only generate a new release when there’s an actual mastering difference in addition to the different matrix number…

1 Like

Yes it does.
Different anything makes it different release.
Different manufacturer means different release-label relationship and (if uploaded) different scans.


To add to that, a different manufacturer can also lead to a different CD master which can lead to different track times and different therefore discIDs.


By this reasoning, every variant in Matrix, Mastering SID Code or Mould SID Code would be a separate release.