Music

Digitized multimedia resources from the Library of Congress: historical sound recordings, sheet music, images, and more.

Ricci Adams's MusicTheory.net has a number of free tools for learning basic music theory, including customizable ear training sessions, elementary notation, rhythm and meter, and key signatures. Matrix calculators (12-tone) and a staff paper generator are also included.

The Library of Congress presents the National Jukebox, which makes historical sound recordings available to the public free of charge. The Jukebox includes recordings from the extraordinary collections of the Library of Congress National Audio-Visual Conservation Center and other contributing libraries and archives.

The Music Division is one of the world's preeminent music collections—documenting the art of music in all its diversity—classical and opera as well as the whole spectrum of popular music including spirituals, ragtime, jazz, musical theater, film, rock and world music.

Database featuring images and sound files of world instruments from the University of Michigan's Sterns Collection.

Music theory reference, tutorials, exercises, and articles. This site is run by a professor at the Conservatory of Music of Puerto Rico; the site is available in both English and Spanish.

A free online course on the fundamentals of music theory.