Radio Diaries

November 23, 1936 was a good day for recorded music. Two men – an ocean apart – sat before a microphone and began to play. One was a cello prodigy who had performed for the Queen of Spain; the other played guitar and was a regular in the juke joints of the Mississippi Delta. But on this day 75 years ago, Pablo Casals and Robert Johnson both made recordings that would change music history.