ii–V–I as shells — closing out the month

The month's last day. The Dm7 → G7 → Cmaj7 ii–V–I from Week 3 — you now play it entirely as shell voicings. There's nothing new to learn today. It's the day the pieces you've stacked up all month click together into "ah, this all connected into one thing." Two things merge naturally:

• Root-string crossing (5·6·5) — Dm7 and Cmaj7 are 5th-string-root shells, G7 is a 6th-string-root shell.
• Guide tones = the shell's color notes — since a shell keeps only the 3rd and 7th to begin with, Week 3's guide-tone line is literally the shell's two notes. That line on the 3rd string moving 5→4→4 — remember it?

So the shell ii–V–I is the most pro-like comping there is: three-finger chords that sing, connected with minimal movement. Everything you learned this month (assembly over a root, the 3rd/7th switches, 5th/6th-string roots, voice leading, the diet) all lives in one progression.

Month recap: you now see chords not as shapes but as "assembly — stacking the 3rd and 7th over a root and switching with fingers." For any chord, just find the root string and the 3rd/7th. Next month you'll paint color on top of this with tensions (the 9th) and top-note melody.

The three ii–V–I shells. Only the root (blue) and guide tones (green 3rd & 7th) remain.

Example 1 — shell guide-tone line. On the 3rd string, Dm7 b7(C) → G7 3(B) → Cmaj7 7(B). 5→4→4. The very same line from Week 3, alive in the shells.

▶ BPM 68. One of the shell's two color notes (the 3rd string) barely moves as it sings. Repeat 4×.

Example 2 — shell ii–V–I comp. Cycle the Dm7 (5th) → G7 (6th) → Cmaj7 (5th) shells with root + guide tones.

▶ BPM 78, repeat 4×. Three-finger chords connected with minimal movement. The month's crystallization — this is pro comping.

0–10 min · Warm-up Fret the Dm7·G7·Cmaj7 shells and check only three strings ring and the dropped strings are dead.

10–20 min · Brain training (today's target = shell guide tones) With Example 1, fret the 3rd string 5→4→4 and confirm where the 3rd and 7th are in each shell. Even as the root string shifts 5·6·5, the color notes stay nearly in place.

20–40 min · Real comping (Example 2 / 74–84 BPM) Over a backing track, cycle Example 2's shell ii–V–I at BPM 78 several times. Is your hand tied to one region (frets 3–6), and do only three strings ring thin and clean? Try D key too if you have room.

40–50 min · Record & reflect + month recap (recommended) Record two laps of the shell ii–V–I. Check: do dropped strings stay silent / are changes fast and smooth / do the guide tones connect? Then ask yourself — "How did I see chords a month ago, and how do I see them now?"

Done when: you can cycle ii–V–I entirely as shells, crossing root strings with minimal movement. (Month 1 complete! 🎉)

• Hand jumping in the shell ii–V–I. Crossing 5th- and 6th-string shells ties you to frets 3–6. A big jump means you chose the wrong root string.
• Slacking on dropped strings. Moving among six shells (three each on 6th/5th roots), the mute easily loosens. Only three strings per chord.
• "I've learned it all" complacency. This month you learned the ingredients (chord assembly). Next month, tensions and top notes paint the color that turns it into real music.
• Skipping the recap. Ten minutes of looking back is fuel for next month's motivation. Feel how far you've come.