I'm a songwriter. A well-known recording artist minimally contributed (1-2 lines of lyrics). I wrote 95% of this song. I am considering offering her joint copyright because she is eager to collaborate, although I write best left alone to do things my way but I feel she is providing my career with a tremendous boost by taking my song, recording it and getting it guaranteed airplay, and therefore income. My question is does it affect me monetarily to distinguish between listing her when I file copyright as contributing: "lyrics by me & her, music by me", as opposed to "lyrics & music by both me and her"? Thanks!