I have a question concerning song copyrighting. I'm working on a project that involves reinterpreting the works of blues singers of the early 1900's who's works are currently owned by publishers. These songs were changed through arrangement by adding or subtracting chords and melody or adding instruments. Parts of lyrics were used in these arrangements by the writer and additional lyrics were added by the current artists. My question is this. My intention is to give copyright credit to the original writer when any part of his or her song is used, but can the current artist also be credited as a writer or collaborator? If so how would this be listed in the credits?