In a release, there are several roles that can be assigned according to the function that every person, organization, or ensemble has executed during its development:

Quality of images . The cover art must not be any of the following: blurry, pixelated, mismatched, cut, misaligned, rotated, incorrect, stretched, mirrored or have any other quality issues. Also, the...

Mastering. In order to ensure good audio quality, and meet the standards of today's music industry, all audio files, must have undergone a professional mastering before their distribution.