Deltarune is an episodic video game, coming out in chapters. Each chapter has its own soundtrack album, usually titled “DELTARUNE Chapter 1 OST“ etc. The chapter number designates not the album itself, but rather, the game chapter that it belongs to.
Recently, there’s been a spree of edits surrounding this. Some editors (including me) want to insert the comma (“DELTARUNE, Chapter 1“), some don’t (“DELTARUNE Chapter 1“), and some want to treat the chapter part as a subtitle and separate it with a colon (“DELTARUNE: Chapter 1“).
The album covers mostly look like this (the logo of DELTARUNE is in all lower case, but always appears fully capitalized in text):
The question is: Do the series numbering guidelines apply in this case? Should there be a comma inserted in “DELTARUNE, Chapter 1“ etc., despite it not appearing in any official sources?
I think the releases should stay with the source name (especially with bandcamp), same with the undertale ost. But releases groups could use the guidelines name
As to keeping the publisher’s release title, the guidelines explicitly specify that “titles should be normalized by following [the] guidelines” (Style / Titles - MusicBrainz). The question is whether “chapter” is considered a word that indicates position within a series—I think so—and whether the rules (Style / Titles - MusicBrainz) apply in this case (i.e., the series in question not being one of albums, but one of video games). The guidelines currently do not specify what all is meant by “series”. I myself would interpret that as any and all series of things.
One of the style principles is to follow the artist intent, so if toby intended for his albums to be named a certain way then we should follow that, also that’s why I mention bandcamp since allows for more flexible naming to the artist (same with steam to my knowledge). If I had to answer your original question then maybe you are right about the comma