I’m still of the opinion that a video game can be within the scope of MusicBrainz, even without a mix-mode CD or MP3s in the game files
I’m all down for a new entity type to represent the “original” release date of a game, movie, TV show, or other product which might be outside the scope of the database
allow me an example that’s “clearly” outside the scope of the database, a Samsung washing machine
at the end of the cycle, it plays a little jingle. this is a recording of Die Forelle by Schubert, listening to the melody on this recording (and surely others)
am I saying we should store all the hundreds of Samsung appliances that play this jingle, definitely not. I am saying that there should be a way to store this data somehow. I don’t believe relegating it to a work is a proper solution either, especially not a still underutilized work as the original edit spawned.
I again go back to the quote from the About page:
As an encyclopedia and as a community, MusicBrainz exists only to collect as much information about music as we can. We do not discriminate or prefer one “type” of music over another, and we try to collect information about as many different types of music as possible. Whether it is published or unpublished, popular or fringe, western or non-western, human or non-human — we want it all in MusicBrainz.
video game music is a quite popular “type” of music, and as such I believe we should try and find a good place for it in the database; find a way to get the original release date in there, all that jazz (sometimes quite literally). I second what’s said above:
as a complete side note, it seems multiple people (1, 2, and 3) have remixed these little washing machine jingles, so maybe they are in the scope of MusicBrainz… WashingMachineBrainz anyone? 
(only mostly kidding)