Credits

Credits (i.e. staff) are required for several reasons:


 * To ensure a song actually exists
 * To ensure accuracy of the database
 * To ensure a song is legal to add
 * To distinguish a song from an OST track
 * For building future features, e.g. song artist mode

Credit to use for artist

 * 1) Use the song's performer
 * 2) * Usually, this is the vocalist
 * 3) * If the performer uses an alias, use the alias and link it to the performer's main name if applicable
 * 4) * If the performer is a named collaboration, use the collaboration's name and link the collaboration's members to the group separately if applicable
 * 5) * If the performer is a named group, use the group's name
 * 6) If no performer is credited, use the song's arranger
 * 7) If no arranger is credited, use the song's composer
 * 8) If none of these are present, the song is likely not legal

Exceptions
See Credits/Japanese cheat sheet for help on transcribing credited artists.
 * For classical pieces, use the composer as the artist instead of the performer