What are the earliest records of the blues?

The earliest records of the blues come from Jelly Roll Morton The Complete Library of Congress Recordings "Guitar Blues", "Music Lessons" and "The Story of Alabama Bound" In guitar blues Morton demonstrates how he played blues guitar in 1895 before switching to the piano and in The Story of Alabama Bound he tells of the many blues piano players he met at the "Flat Tops" in Biloxi Mississippi in 1905