Delta blues giant Robert Johnson (May 8, 1911–August 16, 1938) is one of the most fascinating and mysterious performers in music history. He created an essential body of blues guitar music, recording 29 songs in 1936 and 1937 that would exert a powerful influence on the likes of Eric Clapton, Jimi Hendrix, Keith Richards, Johnny Winter and many others. In this edition of In Deep, we’ll examine the variety of picking techniques and tunings that Johnson used to craft his timeless, deeply emotional music.