Theory
Here's Week 2's finish line. Today you combine all the pieces so far. Onto the 12-bar form (D3), you stack the moved boogie (D2) to complete one lap. Each time the chord changes, you just switch the boogie's root string 5 → 4 → 6. There's nothing new to learn. You're only connecting what's already in your hands. The pieces you've stacked one by one all week finally come together today into the shape of a song. Start easy, as if fitting the last piece of a puzzle. It's fine if it isn't perfect. Making it all the way around once is itself a big achievement today.
Today's core is the move. Keep the boogie hand shape as is, and the moment the chord changes, move only the root string up or down one string. For example, going from bar 1's A7 to bar 2's D7, the hand walking on the 5th string lifts wholesale to the 4th string. Think of your whole hand sliding over to the next string like an elevator, and it gets easy. The finger spacing doesn't change one bit.
Let's look at the root spots of the three boogies once more.
▶ A7 = 5th, D7 = 4th, E7 = 6th string root. The same hand shape walks over these three open strings.
The representative move to complete today is A7 → D7. If these two bars are smooth, the other chord moves follow the same principle and connect right away. So if you etch just this one move into your body today, the whole 12 bars will follow naturally. Each time the chord changes, your hand will find the next string on its own, without you having to puzzle it out anew.
See it
This week's finished piece, the representative move. A whole blues song is really just this one lump moved around by changing chords. Bar 1 the A7 boogie, bar 2 the D7 boogie — the same hand shape moving over one string each.
▶ BPM 80, shuffle. Bar 1 A7 (5th-string root), bar 2 D7 (4th-string root) — just the same hand shape moved up one string each. E7 uses the same shape with the 6th-string root.
Today's practice
0–10 min · Warm-up BPM 65. Revive the shuffle with one bar of the A7 boogie. Check with your foot that the long-short is alive.
This time connect the turnaround move, E7 → D7. It's the spot dropping from the V to the IV.
▶ BPM 80, shuffle. Bar 1 E7 (6th-string root), bar 2 D7 (4th-string root). Start from the low end and drop to the 4th string.
10–20 min · Brain training (today's target = switching the root string per chord) Run the 12 bars in your head, and the moment the chord changes, get the root string (5 → 4 → 6) ready in advance.
20–40 min · Real 12-bar boogie (BPM 80) Stack the boogie onto D3's 12-bar map and go around once without a break. Watch that the boogie doesn't cut out when the chord changes.
40–50 min · Recording / self-feedback (recommended) Be sure to record one lap of the 12-bar boogie: do the moves between the three chords sound smooth.
Today's completion criteria: You can stack the A7, D7, and E7 boogies onto the 12-bar form and play and record one lap with a shuffle, without a break. — This week's deliverable: the 12-bar boogie in A blues (Week 2 complete!)
These are the mistakes that show up most when you connect the 12-bar boogie.
▶ Ring only the boogie strings. If the 6th and 3rd strings leak in the A7 boogie, the sound gets muddy. Block the unused strings with your fingertips.
- The rhythm cuts out at the move. Even when the chord changes, the shuffle doesn't stop. Keep stomping long-short with your foot.
- You find the root string late. Get the next chord's root string ready one beat early.
- The low end is heavy on E7. The 6th-string root is fine, but if the 4th and 3rd strings leak it gets stuffy.
- Skipping the recording. Week 2's result is this 12-bar boogie. Keep even a short one and compare with next week.