Preferred titles in RDA
A comparison of uniform titles (AACR2) and preferred titles (RDA) for musical works
RDA:
Recording titles of works (RDA 6.2.1)
Recording form of work (RDA 6.3)
Recording date and place of origin of works (RDA 6.4-6.5)
Recording date, language, and other distinguishing characteristics of expression (RDA 6.10-6.11)
Recording preferred title for musical works (RDA 6.14)
Recording medium of performance for musical works (RDA 6.15)
Recording key for musical works (RDA 6.17)
Recording other distinguishing characteristic of the expression of musical works (RDA 6.18)
Collaborative works and Compilations of works (RDA 6.27.1.3 and 6.27.1.4)
Authorized Access points representing musical works (RDA 6.28.1.1-6.28.1.8)
Additions to authorized access points representing musical works (RDA 6.28.1.9-6.28.1.11)
Authorized access point representing a part or parts of a musical work (RDA 6.28.2)
Authorized Access points representing musical expressions (RDA 6.28.3)
Work numbers for authorized access points for composers whose works are assigned numbers other than opus numbers or in addition to opus numbers
Thematic indexes used in the Library of Congress/NACO authority file (What the heck is a thematic index?)
Internet sources for authority work for authorized access points for music
Vocal Music Instrumentation Index: movements from JS Bach, CPE Bach, Handel, Jacquet de La Guerre, Campra, Clérambault, Montéclair, Rameau, and other composers using scholarly sources, browsable by instrumentation and text
Composers' worklists on the web | in published scores, books, and periodicals
Russische Komponisitionen (Russian composers' worklists; in German)
Online thematic catalogs
Bach: Bach digital database: information on the works of Johann Sebastian Bach and other composers from the Bach family
Britten: Britten thematic catalogue (BETA version; not yet finalized)
Frescobaldi: Frescobaldi Thematic Catalogue Online (FTCO)
Lully: A thematic locator for the works of Jean-Baptiste Lully
Mozart: Neue Mozart-Ausgabe online
Pachelbel: Pachelbel-Werke-Verzeichnis (PWV) : Vokalmusik (vocal music only)
Schubert: Thematisches Verzeichnis seiner Werke in chronologischer Folge
Telemann: Catalogue TWV
Vivaldi: Works listed by F number, with R, P, RV, and opus numbers
Online score collections
International Music Score Library Project (IMSLP)
Choral Public Domain Library (choral and vocal works by at least 3546 composers)
Free online scores (lib guide from Yale University Music Library)
RISM (Répertoire International des Sources Musicales): information on searching RISM; online catalog of A/I: Einzeldrucke vor 1800 (Individual prints before 1800); A/II: Music manuscripts after 1600; and B/I: Printed collections of the 16th-18th centuries (first half only, covering the years 1500-1550; includes a PDF index of composers
Hofmeister XIX: searchable database of Hofmeister monthly lists of music publications for the years 1829-1900
Ricordi catalog: list of publications from plate no. 1 (1808)-plate no. 41568 (1870); searchable by composer
Staatsbibliothek zu Berlin Musik Imagekataloge (copy of the paper card catalog through 1989)
Sites with digital images of scores and manuscripts
Catalogue of manuscript music in the British Museum; vol. 3, Instrumental music, treatises, etc., 1909 (online version from Internet Archive)
RISM: music manuscripts held in libraries in United States (post-1600)