Very late reply to this one guys but I think there are a few historical precedents for this - I read about Badfinger's 'Without You' (first famously covered by Harry Nillson in the early seventies...) written by Tom Evans and Pete Ham, who are both now deceased... apparently, and by whatever means, the song and the rights to it, somehow changed hands in a lot of legal wrangling to the point where by the time Mariah Carey had recorded and gotten a UK No.1 with it, it was credited to not only to Ham and Evans, but to the other two members of Badfinger and, the most unlikely co-composer attribution of them all, their former manager (at an ASCAP awards ceremony). Also, as far as I know, Paul McCartney only has the rights to one Beatles song, and that is 'Love Me Do', having (foolishly?) sold off the rest of the Beatle's back catalogue, which is now owned by the Sony Corporation, I think. Frankie Lymon and the Teenager's 'Why Do Fools Fall In Love' was collecting millions of dollars in royalties since the late fifties and two of the co-composers of it didn't receive a penny until 1992. Even then, a court ruling was overturned 4 years later and composer credits reverted back to Frankie Lymon and the music businessman Morris Levy, who, technically speaking, had nothing at all to do with the song's composition.