Old (circa late 2021) rule wrote:
If the song was featured or tied to a media after it was released, the source field is optional.
Current rule wrote:
- You must use the Source field if the song comes from or is directly tied to another media such as a video game, movie, series, event, etc. This also applies if the song was featured or tied to a media after it was released, but is primarily known due to that source. If a song has multiple potential sources, any option is valid.
- For remixes, arrangements, or covers based upon the original song, the source of the original song should be used.
- Website names may be used as sources when the song is tied to specific cultural phenomena related to the platform, or the song is composed as a website theme/background song.
- In cases where a song compilation/remix/medley/etc. has songs without a common source, the sources must be put in the tags instead of the source field (unless the compilation is prominently tied to a source itself).
osu! itself should never be used in the source field except in cases where the track was specifically created for osu! (also known as an osu! original), such as commissioned tournament tiebreaker tracks.
Proposal: add "If the song was featured or tied to a media after it was released, the source field is optional." back into the main paragraph of the rule
Don't have much else to say, just made the thread following from beatmapsets/1146702/discussion/-/generalAll#/3607471 since no-one else did. Feel free to discuss