Listen to oldest playable recording of American voice
Optical Imaging of 1878 St. Louis Edison Tinfoil Recording
"This site provides information about the digital restoration of an Edison tinfoil record which dates from 1878. The restoration was done as part of a larger project to restore, preserve, and create digital access to sound recordings using non-invasive optical methods. This project is a collaboration between Lawrence Berkeley National Laboratory and the Library of Congress."
Professor Haber's project site with recordings, photos and text.