What Are Split Sheets? Do You Need Them?
A publishing split sheet (often referred to as a “split sheet”) is a document that clarifies who wrote/composed a specific percentage of a song recorded by an artist. Essentially, it helps music collaborators identify their ownership/share of a song.
Ideally, this sheet should be created for every song you write (or have a hand in writing), before ever shopping it to a third party to be published commercially. It's best if you complete the sheet before the studio sessions are complete, when the contributions are fresh in each person's mind.