384 Key

Field definition and scope:

Field 384 specifies the set of pitch relationships that establishes a single pitch class as a tonal centre for a musical work or expression. The field may be used to differentiate a musical work or expression from another with the same title.

The National level record requirement for this field is Optional.

Field 384 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 384	Key	O	O	R
Indicator:
First	Key type	M
#	Relationship to original unknown	A
0	Original key	A
1	Transposed key	A

Second	Undefined; contains a blank	M

Subfield code:
$a	Key	M	O	NR
$0	Authority record control number or standard number			R
$1	Real World Object URI			R
$3	Materials specified			NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Content designator history:

Field 384 - Key [new, 2010]

Field 384 - Key [changed, 2017]: Field 384 was made repeatable.

Subfield $0 - Authority record control number or standard number [new, 2020]

Subfield $1 - Real World Object URI [new, 2020]

Subfield $3 - Materials specified [new, 2017]