After discussion, amended/expanded suggestions:
Add the following to What to group together:
Different editions of a single containing different b-sides or remixes alongside the main track.
UK singles released as a set of several single CDs, even if some contain only remixes.
Different editions of an album containing different bonus content, including remix discs, alongside the standard album content (even if as additional bonus discs).Examples
- Survivalism by Nine Inch Nails contains both a release with just the single track, and several releases with remixes and bonus tracks.
- Brazen ‘Weep’ by Skunk Anansie was released in the UK as a set of 3 standalone CDs, with CD2 and CD3 containing just remixes, but the single release group contains all 3 releases.
- What Sound by Lamb contains both 1-CD releases, and 2-CD releases including an extra disc of remixes.
And add this to What not to group together:
Remixed albums or singles where the remix(es) are the main content of the release, and the original tracks are not included.
Examples
- Y34RZ3R0R3M1X3D by Nine Inch Nails is a remix album containing just remixes of Year Zero. It doesn’t contain the original album tracks, so it is a separate release group.
- Juicy (Armand van Helden remix) by Doja Cat & Tyga is a remix single of Juicy. It contains only the remix and not the original track, so it is a separate release group.
- Work (remix) by A$AP Ferg feat. A$AP Rocky, French Montana, Trinidad James & ScHoolboy Q is a release group for a remix single (including extra guest verses) of Work by A$AP Ferg. It contains only the remix and not the original track, so it is a separate release group.