I am finding this issue as I look at these promo releases. They often contain a large amount of remixes of the same recording, and sometimes a lossless and lossy copy of the recordings.
The AcoustID, for me, performs perfectly. It can tell even the difference between a WAV and MP3 of the same recording. I did not know this prior I must admit. Learning this gave me two opposite feelings. One was great, it able to pick up on even differences that one may not be able to hear. The other was not great, since MB takes this accuracy and discards it. That is further amplified with bad data, but that is not part of the topic.
If you look at the scenario, if I have such a release, cataloging it into MB provides no benefit. Meaning that my directory listing is more clear than the result in MB. When I look at the directory, I might see this:
- some-recording.wav
- some-recording.mp3
- some-recording.opus
I can visually see here that although the name of the recording is the same, I have 3 very different versions. If I look in MB at this same release, I would see this:
- some-recording
- some-recording
- some-recording
From here I would need to look at other areas to see if I can figure out what is what, and why it looks weird (as it would to many as the same recording is there multiple times. I then also see that each of them has 3 AcoustIDs, where the reality is that each has only 1.
In this case outlined above, it is not the AcoustID that is problematic, it is MB and the structure. As noted prior, it brings into light that MB does not consider mastering, at times. I have seen releases get new recordings from CDs because you can “hear the difference”… which is generally attributed to mastering, likely some sort of remastering of old recordings. While I agree with that, it is an anomaly of sorts as the same is not applied to a digital release.
A digital release does not have the same identifiers as a CD. If I have a CD, there is a lot to look at, we all know the visual attributes in play. With a digital release a lot of that is just not there. So with “release in hand”, my options are far more limited. The AcoustID is a great tool as it is capable of getting in most cases exact results. I believe it would be fairly accurate (if the database supported it) to even take a file and match it to a specific release, like that was this MP3 version or that was this iTunes version, etc. That would help elevate the digital releases closer to CDs, where I can see two releases differentiated only by a single line in a booklet stating made in A vs B.
This is relevant to the topic as these DJ promos are no longer CD driven, although CDs are still available for some. When I take a CD, I can derive easily that this is track 1, this is 2, etc. So when I look it up in MB, track 1 = track 1. So even if all look the same, I can still match the recordings. On a digital release, say one with no track numbers, this is not possible. I have a folder of files and a MB listing that I may not be able to match file to recording. I would however, if the recordings were not all the same in MB. Not just with AcoustID, but with additional detail.