Record the key if one or more of the following conditions applies:
° it is commonly identified in reference sources
° it appears in the composer's original title or the title proper of the first manifestation
° it is apparent from the resource described (unless it is known to be transposed in the resource).
Best practices for music cataloging, version 1.0: If giving key as a component of an access point, routinely also give key in a 384 field. For other works, give key separately in a 384 field if readily ascertainable.
Best practices for music cataloging, version 1.0: Follow the same criteria for recording the mode ("major" or "minor") as for recording the pitch center; that is, if pitch center is given or apparent, but mode is not, record only the pitch center. Record the symbols # and rather than the words "sharp" and "flat."