The Credibility System was scheme Nine Music artist would earn credibility for completing tasks. The credibility was represented by a C and every artist would have a table that shows how much credibility they had.

The more credibility an artist had the more resources would be available to them. If the artist failed to complete a task they would lose a C. It was possible for an artist to get negative Cs (or lose so much that it goes into the red). This made Nine Music a very internally competitive label.

The Credibility System was changed to the update Rank System, that worked on the same principle. This system was eventually scrapped and replace with the Nine Corporation Economy.