TERRY GROSS, HOST: This is FRESH AIR. I'm Terry Gross. Today, we're going to listen to some great recordings from the 1920s and '30s that might have been lost to us if it weren't, for the record-collecting habits of one man. I let our producer, Sam Briger, take it from here. SAM BRIGER, BYLINE: In 1952, the Folkways record label released the "Anthology Of American Folk Music," a six-album set of music curated by Harry Smith. Smith was an eccentric collector of 78s, the first phonograph records, who chose 84 of his favorite songs recorded between 1926 and 1931. They were mostly country and b...