I like to make small alterations to standard tuning that allow smaller intervals in the lower register.

### Am9 (detune the D to C)

Some chords (note the 3rd intervals between the A and C strings):

**Cm7** x-3-3-3-4-3

**C** x-3-4-5-5-x

**Cm9** x-3-3-3-3-3

**D6/9** x-5-6-7-0-0

**A** 5-4-4-6-x-x (or just 5-x-4-6-x-x)

**A7** 5-7-7-6-5-5 (standard E bar shape!)

**Emaj9** 0-9-8-8-0-0 (nice 2nd interval between the F# and G#)

### D6add9 (detune the G to F#)

This gives you an open major 3rd interval and an easy D6add9 in the upper 5 strings. Some chords:

**D6** x-0-0-0-0-2

**G6add9** 3-x-0-3-0-0

**Aadd9** x-0-9-7-10-0

**A6add9** 5-4-4-0-0-0

**A/C#** 9-7-7-7-10-x

**A13** x-0-5-5-7-0

**Em** x-7-5-5-5-x

**Eadd9** x-7-6-5-7-x

**D** x-0-0-0-3-5 OR x-0-0-0-7-x

**Gmaj9** x-5-5-5-7-5