A classic riff to play
To think, many finger-pickers live their day, not realizing others share their origins of starting off with Mississippi John Hurt's, Spike Driver Blues :)
This write-up is based on the recording of it on the album 'Today!'.
What Hurt plays on the recording
The tuning of the song is in standard tuning, EADGBE.
And now, onto those notes...
the Starting G chord
The song starts with the I/root chord -- the G-chord.
It's played with an alternating bassline & pentatonic notes on the treble-side.
Getting into the IV chord
The song continues into the IV/C chord. It's played as a C-chord, with a G-note (3rd fret of the 6th string) in the bass. A C 'over' G, C/G-chord
Bit #1: into the G7
Finally, to complete the chorus of Spike Driver Blues, Hurt plays 3 cycles of these endings,
- First time: Section B - Part 1
- Second time: Section B - Part 2
- Third time: Section B - Part 2 (repeated)
This first ending/bit rests on the G7 chord at the end.