5th-string-root shell set — drop the root down to the 5th string

Yesterday you learned the 6th-string-root shells. Today the root drops to the 5th string. The principle is identical — keep only R·3·7, drop the 5th. But since the root string changed, the 3rd and 7th move to different strings:

• 3rd string = the 7th switch. Fret 4 (7, Maj7) ↔ fret 3 (b7).
• 2nd string = the 3rd switch. Fret 5 (3) ↔ fret 4 (b3).

So the three characters are:

• Cmaj7 shell = 3rd string 4 (7) · 2nd string 5 (3)
• C7 shell = 3rd string 3 (b7) · 2nd string 5 (3)
• Cm7 shell = 3rd string 3 (b7) · 2nd string 4 (b3)

If the 6th-string shell (yesterday) used the 4th & 3rd strings, the 5th-string shell uses the 3rd & 2nd. When the root string changes, the color notes shift up one set. The principle is exactly the same as yesterday, so there's almost nothing new to memorize. When the root drops a string, the color notes follow one string down — that one rule is all you need. Once you have both sets (6th & 5th), tomorrow you can connect a whole ii–V–I as shells. From today, whether a chord's root sits on the 5th or 6th string, you can grab it as a shell.

Three 5th-string-root shells. Green is the 3rd & 7th; this time the 3rd & 2nd strings are the switches. The 6·4·1 are muted.

Example 1 — two-switch check line (3rd & 2nd strings). 3rd string 7↔b7, 2nd string 3↔b3.

▶ BPM 72. 3rd string (7→b7), 2nd string (3→b3). Same principle as the 6th-string shell, just moved strings. Repeat 4×.

Example 2 — 5th-root shell-set cycle. Cmaj7 → C7 → Cm7. Root (5th) fixed, only the 3rd & 2nd strings.

▶ BPM 78, repeat 4×. Cmaj7 → C7 → Cm7. Root fixed, only the 3rd/2nd color notes move. Check the 6·4·1 mutes.

0–10 min · Warm-up Play the Cmaj7 → C7 → Cm7 shells, four beats each. Root (5th) fixed, 6·4·1 muted, only 3·2 moving.

10–20 min · Brain training (today's target = the 3rd/2nd color notes) With Example 1, confirm the 3rd-string (7/b7) and 2nd-string (3/b3) spots. Sort out by eye the difference between yesterday's 6th shell (4·3) and today's 5th shell (3·2).

20–40 min · Real comping (Example 2 cycle / 74–84 BPM) Repeat Example 2 at BPM 78 4×. Then move the root to another 5th-string fret (e.g., D = fret 5). Alternate 6th- and 5th-string shells to learn both in your hands.

40–50 min · Record & reflect (recommended) Record 30 seconds of the 5th-string shell cycle. Check: do the 6·4·1 stay silent, are the three characters distinct?

Done when: with a 5th-string-root shell, you can cycle Cmaj7·C7·Cm7 using only the 3rd & 2nd strings, and move freely between the 6th- and 5th-string shells.

• The 4th string leaking. The 5th-string shell mutes the 4th (below the root). Lightly cover the 4th with the root fingertip too.
• Keeping the 6th-shell positions. On the 5th string, the 7th is the 3rd string and the 3rd is the 2nd string. The root string changes the map.
• A weak 2nd-string 3rd. If the 2nd string's fret 5 (the 3rd) dies, a neighbor is leaning on it. Stand the fingertip up.
• Frustration with the thin sound. Shells are thin by nature. Their value shows over a band/backing, so don't judge by volume when playing alone.