First, let's understand authoring rights:
Mr. Composer Author married Ms. Lyricist Author and thus they became the Co-Author couple. They made a half a baby: the Music Score. Why is this half a baby? Because the music score is only the dna of a music work. They have moral rights on the music score.
“Moral rights are Authors’ or Creators’ rights of copyrighted works generally recognized in civil law jurisdictions and, to a lesser extent, in some common law jurisdictions. They include the right of attribution, the right to have a work published anonymously or pseudonymously, and the right to the integrity of the work. The preserving of the integrity of the work bars the work from alteration, distortion, or mutilation.”
As the music score is only the dna of a music work, they need singers and musicians (interpretors) to give it life so that it becomes a Music Work. It is more than a caterpillar becoming a butterfly. It is more like the design of a house becoming the house itself.
As they do not know any interpretors, the Authors contact Mr. Publisher, a man with a big cigar who knows a lot of famous singers and musicians.
The Authors enter into a Publishing Agreement with Mr. Publisher. Under this agreement, Mr. Publisher is entitled to a maximun of 50% of the patrimonial authoring rights as the moral rights are non-transferable.
Continued on my article Story for understanding music Neighboring rights.