The handful of recordings Delta blues icon Robert Johnson made in 1936 and 1937 are among the most influential songs in music. Disciples praise his high, moaning voice and fleet-fingered guitar work. But have we been listening to them at the wrong speed?
We examine claims that commercial releases of recordings like "Cross Road Blues" play back up to 20 percent faster than they were recorded. Guests include Jon Wilde, writer for The Guardian, and Howard Mandel, arts journalist and president of the Jazz Journalists Association.
This is a repeat edition of Soundcheck.