Classical music libraries/classical music directories and portals, music manuscript libraries and archives
The Music Library Association
Founded in 1931, MLA is the professional organization in the United States devoted to music librarianship and all aspects of music materials in libraries. As of July 1, 2011, MLA is also the United States branch of IAML, the International Association of Music Libraries.
Indiana University Music Library
Library of Congress Recorded Sound Reference Center
The Morgan Library and Museum music manuscripts collection.
The Morgan Library & Museum houses one of the finest collections of music manuscripts in the country. In addition to a large collection of musicians’ letters and first editions of scores and librettos, it has the world’s largest collection of Mahler manuscripts and substantial holdings of Brahms, Chopin, Debussy, Mozart, Schubert, and Richard Strauss. The collection spans six centuries and many countries.
Online Musical Scores. Indiana University Digital Library Program
Library of Congress Recorded Sound Reference Center
Blanche and Irving Laurie Music Library
Rutgers University.
University of California at Berkeley Music Library
Directories, portals
AllMusic.com. Searchable database of recordings and reviews.
Facts about an album or artist, including title, tracks, genre, label, credits, release date, and cover and artist images. Deeper details illuminate an artist or album including styles, moods, years active, instruments, birth/death date/place, and country of origin.
American Society of Composers, Authors and Publishers
Classical guitar midi archives.
Composer index, links, tablature, ancient guitars.
Classical Music Library. Classical.net.
Reviews, articles, repertoire list, works, composer biographies, scores, classical music downloads.
G. Shirmer, associated music publishers.
Gramophone Magazine, U.K.
With composer websites.
The New Grove Dictionary of Music and Musicians
The first edition of this acclaimed reference work to be available online.
Wikipedia encyclopedia entries on classical composers.