Watch the Slow as I Am online guitar lesson by Brad Carlton from Chord Studies: Slow Blues Progressions Vol. 1
This example is a slow blues in A Minor. For this example we really pull the tempo down, so dig in and play those chords with feeling. This progression is in the style of the popular tune "Summertime", originally composed by George Gershwin and eventually recorded by artists such as Billie Holiday, Billy Stewart, and Sam Cooke.