In 2000 Congress passed the National Recording Preservation Act.  This
directed the Library of Congress to make a special archive of sound
recordings "culturally, historically or aesthetically significant."
A recording of Eliot made the first 50 recordings picked.  See the
webpage at the NPR website.

The list of the 50 recordings picked is at the Library of Congress site:

Among them:

Harvard Vocarium record series. (1930-1940s)
    Harvard Vocarium was a record label produced by the Harvard University
    Poetry Room in the 1930s and 1940s, which featured authors reading
    their own works. Among the writers recorded were T.S. Eliot,
    W.H. Auden, and Tennessee Williams.

Edison Exhibition Recordings dating to 1888

Rhapsody in Blue. George Gershwin at the piano (1924)

"Who's on First." Abbott and Costello's first radio broadcast version. (1938)
    (The comedy routine mentioned recently on the TSE list.
     Abbott and Costello's picture appears at the NPR webpage.)

Philomel (Look it up - Jug Jug)

Rite of Spring. Igor Stravinsky conducting the New York Philharmonic. (1940)
    (Eliot's pal made it too!)

"Respect!" Aretha Franklin. (1967)

    Rick Parker