The first seventh chords you will learn are the A seventh, D seventh and E seventh chords. Please note: The correct name for these chords is "dominant seventh", however the name is often abbreviated to "seventh" and written as such.
A7
D7
E7
On The Seventh Day is a variation of the twelve bar Blues progression which has appeared earlier in the book. By incorporating the A7. D7 and E7 chords into the progression, a more "bluesy" effect is created. A new rhythm is used for the example. The rhythm is counted 1 and 2, 3, 4and.
This time every string is used to play the lead guitar riff which accompanies the rhythm to On The Seventh Day. Special attention should be given to the suggested pick motion of the right hand and the left hand lingering.