@Tyler Watts a split is a doc that's states how much of a percentage each party is owed as either a songwriter or producer etc. The producer means different things. It's a position that helps the artist realize their vision. That could include, songwriting, arranging, lyrics. It could be helping with instrumentation, engineering and mixing. Define the meaning with the artist upfront. A producer I admire, told me once " I could throw 100 ideas out to the band and they could reject 99 of them and the 1 idea they like, they don't actually use the full idea but it morphs into something cool, then I did my job".