A Contributor is a person who participated in the creation of a Work, Recording or a Release. Everyone from writers to performers to engineers and release marketing staff can be associated with Works, Recordings and Releases. An ISNI is an International Standard Name Identifier (ISNI), an identifier for uniquely identifying the public identities of contributors to media content such as books, TV programs, and newspaper articles. David Bowie playing keyboards on Iggy Pop’s “Lust for Life” is a contributor, not an artist in this case.