Cameras and microphones are virtually everywhere these days, and it seems just about everything that happens is preserved forever on the internet.

Of course, it wasn't always that way. The Library of Congress has just reported that 80 percent of motion pictures filmed before 1930 -- and countless audio recordings from that era -- are gone. But the library has a plan to stop this bleeding of priceless history.

A 1936 Louis Armstrong recording is an artifact nearly lost to time. It's a nickel-plated disc widely used to record sound in the first half of the 20th century.