The Music Library Association is the 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.
The Music Publishers Association is the oldest music trade organization in the United States, fostering communication among publishers, dealers, music educators, and all ultimate users of music.
The International Music Score Library Project is a virtual library of music scores in the public domain. There are over 110,000 works from over 14,000 composers.