AEI-Guatemala is a non-profit Collective Management Society created to defend and administer the economic rights of all Guatemalan authors. AEI negotiates, on the behalf of their authors, the conditions under which their works will be used by the broadcasters. In addition, they also grant users the respective authorizations, and control how the use of authorŐs copyrighted works is made, collected and, finally, distributed it among the beneficiaries.
Music Publishing is the business of protecting and promoting song copyrights and collecting the royalties that these copyrights generate. Think of a song as intellectual property (it's an original piece of art!), and music publishing as the business that makes sure that songwriters get paid a fair compensation when their intellectual property is used by companies. Those companies could be record labels (mechanical royalties), radio stations, bars, and restaurants (performance royalties), or film studios and advertising agencies (sync license fees), and many more.