The New York Public Library - Inside the Piano - The Library Music Division

What did John Cage do to the piano?
Librarians at The New York Public Library for the Performing Arts know.
The Librarys Music Division is one of the world's preeminent music collections, documenting the art of music in all its diversity — opera, spirituals, ragtime, jazz, musical theater, film, world, orchestral, rock, and pop.
The divisions vast collections illuminate an art form that is as diverse as humanity, but particularly noteworthy is the American Music Collection, whose holdings range from the first edition of "The Star-Spangled Banner" to Native American songs, to extensive manuscript collections of such major American composers as Louis Moreau Gottschalk, Charles Tomlinson Griffes, Henry Cowell, and John Cage.