TONO is a Norwegian collection society/performing rights organization that is owned and governed by its members: composers, lyricists and music publishers. TONO is a non-profit society, all revenues are passed on to members for the performance of their works. TONO manages performance rights for musical works in Norway and collects fees for their public performance.
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.