The splendid archive.org has an edition of The Grand Ole Opry available to view / download.

The link is http://www.archive.org/details/GrandOldOpry-28april1956 and the show features Host: Carl Smith - Guests include: Buddy Ebsen, Chet Atkins, Collins Kids, The Jordanaires, June Carter, Flatt and Scruggs, Minnie Pearl, etc.

If you're interested in country, it's well worth a look.