A 12-bar where the 1, 4, and 5 are ALL dominant 7ths (E7 A7 B7).
the minor/blues pentatonic — over MAJOR chords (the famous 'wrong' scale) — SCL·02
the MAJOR pentatonic for the sweet answer — pros slide between the two ('BB King box') SCL·01
The magic of major-key blues: the minor pentatonic's ♭3 rubs against the chords' major 3rd — that grind IS the blues. Trade it with the major pentatonic for light and shade.