I’ve spent the last handful of hours trying to find some documentation or discussion on how music released on YouTube should fit into MusicBrainz.
There is this thread from 2017 that touches on the subject but I have a feeling things may have changed since then!
Most voices seem to say that anything released on YouTube should be entered as stand-alone recordings. The common explanation (I believe) is that you cannot release albums on YouTube, only playlists. Recently it seems YouTube has added a way to mark playlists as albums/singles? See https://www.youtube.com/@[musical artist name here]/releases
Underneath it still looks like a playlist, however. I’m not sure if artists are able to modify them after the fact, which would make it harder to claim they are proper releases. Although, this seems to be a bigger problem with digital releases in general.
Some artists only ever release their work on YouTube, as has been mentioned in previous threads, so being able to enter information about those works into MusicBrainz is important (I listen to a lot of music only released on YouTube, so being able to tag those properly is esp. important to me specifically, but I’m sure I’m not the only one!)
Standalone recordings are fine but there is so much information that can’t be entered into just a recording without a release. Information like language or annotations. Further, if a video contains multiple songs (such as when an album is just released as one big video), there’s no way to convey that via standalone recordings except with clunky relationships that is pale in comparison to regular media/releases.
This is more of a UI note, but if an artist only releases on YouTube, then their artist page here will look rather barren unless one navigates to the recording page. If you want to find out what ‘albums’ they have released you would have to piece it together over the entire list of recordings.
There are many types of music that tend to stick just on YouTube. Important to me are songs (esp. covers) in Toki Pona. Entire swathes of music catalogues are just available on YouTube. Perhaps they are not properly released, but people do listen to these tracks!
In my humble opinion, a more integrated way to show these releases would be a great boon. To quote aerozol from that 2017 thread:
But maybe I am off my rocker! I greatly want to hear from those more experienced with the database. There are a lot of songs I would love to add to MBZ but would hate to enter them incorrectly, in addition to the myriad songs already added that could use some systematization.