What happened in Discogs in January 2020?

Normally I would have expected this post to have been published earlier, but Discogs didn't release its data earlier. In the past the data dumps would be released around the 4th or 5th of the month, but now it took until February 24th before there was a data dump. I then looked at the data and just threw it into a corner and left it there for a few months.

This is going to be a little bit different than the other blog posts in this series. The reason is that the internal format seems to have changed again. In the past the dump file would grow with around 100 MiB per month and it has done this very consistently over years. So when I saw that in one month the archive had grown with 1 GiB (about ten times the expected increase) I knew something was up. A short inspection: a lot of the YouTube video information is now included, so comparing the XML data as I have done so far actually makes no sense at all, as with the new data that is included a release would have been marked as "changed", even when the only change was a YouTube link but not the actually relevant data. Rewriting my comparisons is on my TODO list but for that I first need to find the time. Bah.

So, no comparison to how things were last month, but just a bit about the smells.

Smells

I found 2158 possible smells in newly added releases (ignoring tracklist errors which still remain the bulk of the errors). It is very similar to previous months: a bit less than half are label codes, around a quarter are SID codes, and then the rest.

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SID codes (part 1)

One thing that I only learned about after using Discogs is the so called Source Identification Code, or SID. These codes were introduced in 1994 to combat piracy and to find out on which machines a CD was made. It was introduced by Philips and adopted by IFPI, and specifications are publicly available which clearly describe the two available SID codes (mastering SID code and mould SID code). Since quite a few months Discogs has two fields available in the " Barcode and Other Identifiers " (BaOI) section: Mould SID code Mastering SID code A few questions immediately popped up in my mind: how many releases don't have a SID field defined when there should be (for example, the free text field indicates it is a SID field)? how many releases have a SID field with values that should not be in the SID field? how many release have a SID field, but a wrong year (as SID codes were only introduced in 1994) how many vinyl releases have a SID code defined (which is impossi

SPARS codes (part 1)

Let's talk about SPARS codes used on CDs (or CD-like formats). You have most likely seen it used, but maybe don't know its name. The SPARS code is a three letter code indicating if recording, mixing and mastering were analogue or digital. For example they could look like the ones below. There is not a fixed format, so there are other variants as well. Personally I am not paying too much attention to these codes (I simply do not care), but in the classical music world if something was labeled as DDD (so everything digital) companies could ask premium prices. That makes it interesting information to mine and unlock, which is something that Discogs does not allow people to do when searching (yet!) even though it could be a helpful filter. I wanted to see if it can be used as an identifier to tell releases apart (are there similar releases where the only difference is the SPARS code?). SPARS code in Discogs Since a few months SPARS is a separate field in the Discogs

Country statistics (part 2)

One thing I wondered about: for how many releases is the country field changed? I looked at the two most recent data dumps (covering February and March 2019) and see where they differed. In total 5274 releases "moved". The top 20 moves are: unknown -> US: 454 Germany -> Europe: 319 UK & Europe -> Europe: 217 unknown -> UK: 178 UK -> Europe: 149 Netherlands -> Europe: 147 unknown -> Europe: 139 unknown -> Germany: 120 UK -> US: 118 Europe -> Germany: 84 US -> UK: 79 USA & Canada -> US: 76 US -> Canada: 65 unknown -> France: 64 UK -> UK & Europe: 62 UK & Europe -> UK: 51 France -> Europe: 51 Saudi Arabia -> United Arab Emirates: 49 US -> Europe: 46 unknown -> Japan: 45 When you think about it these all make sense (there was a big consolidation in Europe in the 1980s and releases for multiple countries were made in a single pressing plant) but there are also a few weird changes:

Vinyl & Data

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