I recall hearing about members of Creedence Clearwater Revival sueing each other for over 20 years. The main singer wanted to sing some of their hits, on which he had lead vocal. Somebody in the group refused to allow it for a long time. Probably somebody who’s vouce was never good enough to lead a song.
Dude! John Fogerty was sued by his brother dan forgerty because john fogerty wrote all the songs and the music for CCR, and when JOHN started his solo career, john sounded too much like CCR! John had SIGNED away the rights to CCR to a really shady manager. and the manager is the one who told Dan to sue his own brother for stealing the CCR SOUND.