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CD+G releases in Discogs

For many years to me an audio CD was just a silver disc with music on it. But as I already discovered with for example the ISRC codes on CDs there can be more data on an audio CD than most people know.

One thing is that on some CDs there are also graphics that can be displayed on a system capable of displaying some rudimentary graphics, such as karaoke machines. The format is called CD+G (CD plus graphics) and it can be recognized (amongst others) by the compact disc logo with the word "graphics" included.

So I wanted to know: how many CD+G releases are there in Discogs? Plus, how many have possibly gone undetected and can I detect them?

In the format section there is a checkbox for CD+G, but some people have entered it into the free text field (which is incorrect), so I checked both.

There are currently 352 releases in the database where the release either has the CD+G checkbox checked (350 releases) or where it is in the free text field (2 releases, but fixed now). They are distributed in Discogs as below (column 0: releases 0 - 999,999, column 1: releases 1,000,000 - 1,999,999 and so on):

Distribution of CD+G releases in the Discogs database
Then the question is: how many releases are out there that should have been tagged as CD+G but aren't and how to find out?

One thing that I noticed is that some releases (like this one) actually have "CD+G" as part of the text in the CD matrix. I found 4 releases where there is "CD+G" in the matrix and the release has not been tagged as CD+G, but for none of the four there is conclusive evidence that they actually are CD+G releases. For example the logo on the CDs (as far as I could check) is the regular compact disc logo.

Because not all of the releases in the database have their matrix field filled in I guess that there might be a few more releases that actually are CD+G but haven't been tagged as such.

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