Music Cataloging at Yale ♪ Preferred titles
Work numbers for authorized access points for composers whose works are assigned numbers other than opus numbers or numbers in addition to opus numbers
See also Thematic catalogs
Many composer's works are assigned work (or thematic index) numbers in addition to or in place of opus or serial numbers.
For a list of thematic indexes currently being used in the creation of authorized and variant access points in the Library of Congress/NACO Authority File (LC/NAF), see the Music Library Association Cataloging and Metadata Committee's Thematic Indexes Used in Library of Congress NACO Authority Files