Dolly Parton wouldn’t let Elvis cover “I Will Always Love You” because if Elvis recorded a song you wrote, you had to sign over half the publishing rights even though he never wrote a lyric in his life.
Jerry Reed got one over on him though when they needed Jerry to play Guitar on “Guitar Man” because of Jerry’s weird tuning and finger picking style. Got the song recorded, manager walked over to have Jerry sign the paper, Jerry pretty well told him to stick it up his ass, they could either let Jerry keep all the rights to his song, or the whole session was a waste of time.