Electric guitar slide blues in Open A tuning 335 Givson, sounds a bit busy with harmonica backing track, but you guitarists know how vocalists and harmonica players love to hog the limelight.
Own composition(sounding a lot like a very poor man's Ry Cooder imitation, (in my head that is), Open D Minor , F# down to F , gives it the sadder minor feel.
As they said in Spinal Tap, I think ,
D minor, the saddest chord in the world man!