Brazilian Society of Authors, Composers and Writers of Music or SBACEM is a Brazilian institution that collects the copyrights of public musical performance of Brazil. SBACEM is one of the main members of the Central Office of Collection and Distribution (ECAD), the only body authorized by the Federal Supreme Court to collect musical public execution rights and those related to it, having been founder of the organ and the first to conform to the laws that regulate the copyright in Brazil. SBACEM follows in its ideal that it is the permanent struggle for the rights of the author, as part of the principle that a society of authors must be directed and administered by its own authors.
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.