Steve is right, composer would be listed in the 100 tag. Conductor will most likely be listed in the 511 tag which lists performers/participants in a work. As always, local cataloging practices may vary but those are the standards.

Thanks,
Ron

-----Original Message-----
From: Code for Libraries <[log in to unmask]> On Behalf Of McDonald, Stephen
Sent: Tuesday, July 28, 2020 11:42 AM
To: [log in to unmask]
Subject: Re: [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?

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
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-----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?