SongKong's primary source of data is MusicBrainz. If you are familiar with MusicBrainz you will know it has very clearly defined terminology, but some of this terminology is not well understood outside of the MusicBrainz community. So I have used simpler terminology in this guide and SongKong itself whenever possible.
Within MusicBrainz when an artist records a new album or single this is known as a Release Group , typically this is then released in different formats and different countries on different dates. Each version of this is known as a Release. Every song on a release is a Recording, and the same recording may be found on multiple releases, including releases from different release groups.
Within SongKong we use the term Album for any type of release, and indeed release group. Where we need to differentiate between a release and a release group we use the term Album (Specific version) and Album (Any version). We use Song instead of recording, and when we want to refer to a recording without a release we use Song Only