MARC Report version 245 adds support for:
New Bibliographic content designators
Subfields
Tags 336, 337, 338 -- $0 Authority record control number or standard number (R)
Fields
348 Format of Notated Music (R)
See: MARC21Bibliographic Data, Update No. 21
New Authority content designators
Subfields
Tag 336 -- $0 Authority record control number or standard number (R) Tag 670 -- $w Bibliographic record control number (R)
Fields
348 Format of Notated Music (R)
See: MARC21 Authority Data, Update No. 21
MARC Codelist changes