>...
> Are you really comfortable playing shells, both rooted and rootless?
>
> I.e. R 3 7 or 3 7 .
Yup. Thirds and (flat) sevenths form a diagonal chord across the neck
(except for a jump on the B string), sort of like the augmented triad
in reverse. Flatting or sharping the thirds and sevenths or adding a
root to that is easy.
Are there any systems for extending or altering shells?
Do you know of any other guitar chord systems that work? As I continue
studying the guitar, I find that the more different ways I know how to find a
chord, the better and smoother my chording is.
Cheers,
Kevin
"The world is so full of a number of things,
I'm sure we should all be as happy as kings."
- Robert Louis Stevenson