A large collection of music scores in the public domain.

Search the entire collection of notated music at the Library of Congress.

"The LiederNet Archive is the world’s largest reference archive of texts and translations of art songs and choral works."

"The Music Treasures Consortium provides online access to the world's most valued music manuscripts and print materials, held at the most renowned music archives, in order to further research and scholarship."

A mostly-free collection of sheet music and recordings.

The purpose of the Digital Mozart Edition is to "make Wolfgang Amadeus Mozart's musical compositions widely and conveniently accessible to the public."

Explores America's history through songs. Includes sheet music, essays, maps, and recordings.

An association of more than 240,000 U.S. composers, lyricists, songwriters, and music publishers. Its database provides detailed information on song titles, composers, artists, and publishers of works in the ASCAP repertory.

A musicological organization which researches, promotes and produces publications on music.
Publication: Journal of the American Musicological Society (JAMS)

Support string and orchestra teachers and players with providing teaching resources, professional education, local and national events, a career center, insurance programs, and access to a vibrant and collaborative strings community.
Publication: American String Teacher

Membership-based organization for musicology at the international level
Publication: Acta Musicologica

Professional association for music libraries and librarianship in the United States. Founded in 1931, it has an international membership of librarians, musicians, scholars, educators, and members of the book and music trades.
Publication: Notes

Developed and maintained by BMI, a non-profit organization representing more than 300,000 songwriters, composers, and music publishers. Repertoire, its database of some 6.5 million song titles, is searchable by artist, title, publisher, or writer.