You should not put credits.

This situation is similar to hiring live persons as paid session guitarists who have signed a release form that get paid as workers but not as copyright owners (no right to future royalties). Be sure about the legal aspect of giving credits.

Dont give credit when credit is not due.


Who composed Yesterday? And yet why does Lennon get 1/2 of profits in the next 100 years?
http://en.wikipedia.org/wiki/Yesterday_(song)