The National Recording Registry (set up to preserve sound recordings "that are culturally, historically or aesthetically important, and/or inform or reflect life in the United States")has announced the current crop of recordings select for the registry. This the NRR's third year since started in 2002 by the Library of Congress.
Among those chose are these gems:
“Rachmaninoff Piano Concerto No. 2 in C minor", Sergei Rachmaninoff, piano; Leopold Stokowski, conductor, Philadelphia Orchestra (1929)
"Tchaikovsky, Piano Concerto No. 1, op. 23, b-flat minor", Vladimir Horowitz, piano; Arturo Toscanini, conductor, NBC Symphony Orchestra (1943).
A full list of the newest recordings selected for the registry can be found here and you can find the National Recording Registry on the web right here