1. Music publishers administer songwriting copyrights by finding users of songs, issuing licenses to collect royalty payments, and distributing money to songwriters.
2. Major sources of income for publishers include mechanical royalties paid by record labels for songs used on recordings, as well as performance royalties collected by PROs like ASCAP and BMI.
3. Record labels use controlled composition clauses to limit the mechanical royalty rates paid for songs written by artists in order to reduce costs, though more successful artists can negotiate better terms.