Sometimes the business of being a songwriter or musician can seem overwhelming, an endless muddle of tasks ranging from registering with a PRO (performance rights organization) or CMO (collection management organization), and tracking royalties to negotiating contracts. The good news is that there’s one number that makes the important job of ensuring royalties end up in your pocket easier for all involved. It’s the IPI (Interested Party Information) number -- and chances are, you may already have one.