Would that be Vanilla Chai & the 1/2 Strength Lattes?
In Australia there's copyright available for the arrangement as well as the song, (for the purposes of most of the world the song consists of the lyric if any & the melody - not the chord progression I've been told & that's weird because the melody comes from the chord progression or visa versa & some songs are heavily riff based - that might transpire that if you write the chord progression before the melody is written by someone else there could be some argy bargy - now, if you write the lyrics as well as the chords that the melody comes from you'd have to double dip).
What is needed is a gentlemen's agreement, (albeit in writing), as has been mentioned, be it as generous as the sex pistols (band credit for all songs) or as niggardly as most of rock's lovely ones.
Unfortunatelty making such an agreement fairly and without duress is difficult when you're not holding the cards, chop sticks and rubber hose.
Also: if the songs weren't fully formed/structured when you brought it to the band (as mentioned previously) they may have a case for having jammed/talked/knocked the songs into shape.
I'm pretty sure you can't avoid paying them a royalty for their performances based on sales of downloads or the CD UNLESS you specifically hired them for sessions only & as a backing band in performance. IF they undertook the recording & arranging as part of a band the assumptions are pretty obvious. Then again they may be working for you free of charge or commitment.
Here ya go:
https://homerecording.com/bbs/gener...ng-composition/song-writing-arguement-332958/ (sic)
Here's another thread that addresses this topic that had a wide response and some terse words (not least from me) so you ought to have a squiz.
As Queen mentioned on an early song: "there's got to be a loser in the end..."
Just like the rhythm sections of The Jam, The Smiths, and a whole lot of somewhat impoverished non song writing pop people out there.