Anyone who has participated in the making of a recording in some role (as performer, songwriter, producer, cover art designer and so on) can register to the service and mark his/her roles in albums, tracks and videos. User interface enables one to set roles very quickly in several albums. Roles can also be marked for others and invite them to the service. After registration, the user can confirm and edit the contributor roles already marked for him/her. This information also automatically creates profiles for musicians which lists all the music they have contributed to. Profile works as a public portfolio.