National Steel Blues - Key of A. Among acoustic and resophonic guitar blues players, this piece has become one of the absolute staples, like the 'Stairway To Heaven' or 'Smoke On The Water' of the genre and is simply one of the standards that you simply have to know. On our recording the line up features slide playing on a single cone National-style guitar in open G tuning (DGDGBD) with a capo on the 2nd fret, acoustic guitar in standard (EADGBE), upright bass and harp. The track is a primitive rural Mississippi Delta blues performed in a style reminiscent of musicians like Son House, Charley Patton and Robert Johnson. This sounds great with electric or acoustic lead guitar playing off the slide and harp lines.