Big thanks to The Library of Congress and Brian Foo for allowing this to be possible.

From the article:

Users will have access to a massive audio collection that dates back over a hundred years, almost to the invention of the phonograph. According to the L.O.C., there will be three ways to access these sound files: an interface for searching by sound and metadata; a simple music-creation app that easily allows the collection to be remixed with hip-hop beats; and various “sample packs” full of thousands of clips from particular collections.

Article link: 

Library of Congress/Citizen DJ link: