Watch the Horn Lines 4-5 online guitar lesson by Matthieu Brandt from Jump Blues
A continuation of thicker sounding accompaniments, sounding like a whole batch of horns. Be careful not to sound too loud, keep a steady rhythm pattern.
In these examples damping strings is crucial, especially open ones. In most keys they will sound off.
Call and response is often used by playing different shapes / forms of the same chord or using the same chords with different extensions (9, 13, sus 4)