A work composed by a person would have that person listed as an author in the 100 field. I don't think a conductor is supposed to be listed in the 100 field of a performance. Steve McDonald [log in to unmask] -----Original Message----- From: Code for Libraries <[log in to unmask]> On Behalf Of don warner saklad Sent: Tuesday, July 28, 2020 2:28 PM To: [log in to unmask] Subject: [CODE4LIB] With MARC how do you search out from a catalog a conductor's own musical compositions separating from the conductor's many performances of other composers' works? With MARC how do you search out from a catalog a conductor's own musical compositions separating from the conductor's many performances of other composers' works?