It’s a wrong analogy because two pairs of socks serve a purpose, no, what are you talking about?
I posted in the sense that doing as you said would end up creating these quantities of releases within the same release group. Posting the bonus discs in the “promotion” stats would clear things up like @arifer said.
Second hand stores may also sell CDs missing a booklet, multi-disc sets missing a disc, etc. The point is that MB releases are defined by how they are released/published by the artist or label, not how they may be found “in the wild”. Just like @jesus2099’s socks were originally sold in pairs, even if he’s since sold all his left socks on ebay.
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I think we understood that and we said is totally fine. 
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I consider that a problem. So isn’t the important thing there not your opinions, but clear guidelines that everyone can agree on?
Something that is “sold together” doesn’t necessarily mean it’s a single MusicBrainz release. You’d typically expect a MusicBrainz release to have been originally packaged together, not just “sold together”. If you take a product off the shelf, take it to the register, and the clerk gives you a separate gift, that’s clearly two separate MusicBrainz releases to me.
That’s how we used to deal with Japanese releases from labels infamous for doing this, like EXIT TUNES.
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Is there an official way to get only the second product (the said gift)?
If not, it means that it is only available as a bundle, and I don’t see why it should not be the same release.
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Where is the source for this?
I’d think of the 2nd as a separate promo release. When I worked in retail, we had these types of promotions all the time. It’s not really a bundle of the original because you might only get 50 of the 2nd discs but have a 100s of the original in a shipment.
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Yes but here it’s not just random promo CD that you get for the purchase of any CD.
I already had some, too.
2 release groups.
Here it’s like if you buy this depreciation album in this shop, it comes with this specific bonus CD.
I had some too. No in fact I checked, of course they do exist but I don’t remember being in this case.
1 release.
But I think only got some useless shop exclusive goodies editions: same kind but as there is no musical content, it’s not necessary IMO to create releases.
There are also some useless goodies editions (not shop specific) with specific catalogue numbers, these are also specific distinct releases, then.
It’s why it’s sometimes called limited first press edition, maybe no? 
But enough maybe…
@yakumo0209 just edit the way it seems clever to you until some other can who has this in their collection will be more legit, relevant and related.
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No, retailer bonuses are not first press editions. The retailer CDJapan distinguishes the two, and you can find the same distinction in other databases like VGMdb.
A first press edition means that it’s a single packaged product. Example: CDJapan : Finest Assassin Gets Reincarnated in Another World as an Aristocrat Vol.1 Animation Blu-ray - the label literally manufactures something entirely different (and completely inferior) if you order it today, despite the barcodes on the (different) packaging being the same.
An external bonus is external to the original product, and is a separate item. Example: CDJapan : Tasty City Yui Nishio CD Album
Thanks for your example:
External Bonus
CD with songs performed by the guitar and singing only (Spice Girl / Cheat Day / Machi Chuka / suitcase / tasty tasks)No longer available
I don’t think you could/can buy this one separately (even if it is not attached), it’s like my head music + leaving I got from La Fnac.
Whether you can buy something from the past that’s out of print is besides the point. See Bonus Disc - #38 by yindesu
Read my posts again: not possible (at the time of release) to buy separately = same release.
And we are talking about specific bonus offered with specific album.
But @yakumo0209, the disagreement in this topic should not prevent you from editing your releases any further, it’s peanuts.
Go ahead and edit.
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In the meantime, I’ll edit the releases that pertain to artists I like and understand well. Thanks for the length, guys.
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I guess my main question here would be one of intent. Is it “buy from our store and you’ll get this other random-ish disc thrown in for free as a store promo” or is it “buy from our store and you’ll get a bonus related disc in the same way iTunes or some other digital retailers used to offer bonus tracks or some CDs come with a digital download code”? The first I’d add as a separate release, the second as a 2xCD.
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Release group “おとぎ” by Eve - MusicBrainz demonstrates both.
As usual, there’s the unanswered question whether the releases are in the right release group. I think since there’s no shared recordings, the external bonuses should be in separate release groups, linked to each associated release with Relationship Type / Supporting release - MusicBrainz. Does that make sense to you?
One of the reasons I feel releases like this should not be separate releases groups is it makes a bit of a mess of the discography. Especially as these are not actually available on their own. So not really an official release to list.
This is one of those ways of trying to make a collector go visit all the stores. Just like when different coloured vinyl is stocked in different stores.
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Promotion release groups are hidden from the default MusicBrainz overview, so this shouldn’t be a good reason to ignore the original purpose of the release group, IMO. (However, IMO, pre-ordering a digital album that releases a couple tracks early is different.)
Yes, the unstated purpose of these kinds of external / retailer bonuses is to make you buy the same release multiple times.
If you separate releases (groups?), please link them with an appropriate relationships.
If there is no appropriate relationship,… well, it means you should not have made them separate releases.
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