Watch the Blues for Willie online guitar lesson by TrueFire from Play Bass Guitar 5: Styles & Techniques

Blues for Willie - Overview is a video guitar lesson presented by Andrew Ford and is sourced from Blues Bass Survival Guide.

Here we have a blues form where the 1(I) chord is extended, in this case 8 bars but that all depends on the vocalist or leader, it can be longer or shorter. There is a unison type riff played to set up each vocal phrase and typically a big build into the introduction of the 4(IV) chord.