Now you’ve had a play around with the minor blues scale in C, we can start building up the slow blues. We’re going to be using a 12 bar form with this structure:

C7 | F7 | C7 | C7 |

F7 | F7 | C7 | C7 |

G7 | F7 | C7 | G7 |

Here are the chord voicings in the left hand:

Practice this until you can play it smoothly and without pauses or hesitations between the chord changes.