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Generic "Slash Bass" Leadsheet Notation
Codified
J.Brent©2005
The number symbol after the slash is a Bass Note.
Ex: Dm7/G
(D minor seventh chord over a G bass note)
* * * * * * *
Writing a "chord over bass note symbol"
using roman numerals
and "Generic Slash Bass Notation"
Dm7/G
(in C) is written as iim7/4
The "4" after the slash represents
the bass note's degree
in relation to the root of the chord
G
is the 4 of Dm
* * * * * * *
Naturals
Bass notes without a flat or a sharp in front of them
are considered "naturals"
in relation to the major scale built off the root of the chord:
2 = M2 = 2 half-steps from the root
3 = M3 = 4 half-steps from the root
4 = P4 = 5 half-steps from the root
5 = P5 = 7 half-steps from the root
6 = M6 = 9 half-steps from the root
7 = M7 = 11 half-steps from the root
* * * * * * *
Complete Generic Slash Bass Notation
Chart
|
Slash Bass Notation
|
interval
|
half-steps
|
|
/b2
|
m2
|
1 half-step from the root
|
|
/2
|
M2
|
2 half-steps from the root
|
|
b3
|
m3
|
3 half-steps from the root
|
|
/3
|
M3
|
4 half-steps from the root
|
|
/4
|
P4
|
5 half-steps from the root
|
|
/#4
|
aug4
|
6 half-steps from the root
|
|
/b5
|
dim5
|
6 half-steps from the root
|
|
/5
|
P5
|
7 half-steps from the root
|
|
/#5
|
aug5
|
8 half-steps from the root
|
|
/b6
|
m6
|
8 half-steps from the root
|
|
/6
|
M6
|
9 half-steps from the root
|
|
/b7
|
m7
|
10 half-steps from the root
|
|
/7
|
M7
|
11 half-steps from the root
|
* * * * * * *
Simple examples:
C/D = I/2
G7/B = V7/3
Am/G# = vim/7
Examples in common progressions:
1:
Am:
| Am AmM7/G# | Am/G Am6/F# |
| im imM7/7 | im7/b7 im6/6 |
2:
Am:
| Am C/G | D7/F# F |
| im bIII/5 | IV7/3 bVI |
3:
G:
| Am7 Am7/B Am7/C Am7/C# | D7 |
| iim7 iim7/2 iim7/b3 iim7/3 | V7 |
4:
C:
|
C | E/B
| A7 A7/G |
| I |
III/5 | VI7 VI7/b7 |
| A7/E A7/C#
| D7 D7/Ab | G7 G7/B |
| VI7/5 VI7/3 | II7 II7/b5 | V7 V7/3
|
* * * * * * *
Tunes That Change Tonal Centers
Some tunes start out in major and then move to the relative
minor
at the bridge (and vice versa), and then there are tunes like "Giant
Steps".
"Giant Steps" (in 2/4)
by Tonal Center
| B: |
(| C#m |
F#7 )| BMaj7 | |
| (| iim
| V7 ) | Imaj7 | |
| |
|
| G: |
| D7 | GMaj7
| |
| | V7
| Imaj7 | |
| |
|
| Eb: |
| Bb7 |
EbMaj7 | EbMaj7 | |
| | V7
| Imaj7 | % | |
| |
|
| G: |
| Am |
D7 | GMaj7 | |
| | iim
| V7 | Imaj7 | |
| |
|
| Eb: |
| Bb7 |
EbMaj7 | |
| | V7
| Imaj7 | |
| |
|
| B: |
| F#7 |
BMaj7 | BMaj7 | |
| | V7
| Imaj7 | Imaj7 | |
| |
|
|
| Eb: |
| Fm | Bb7
| EbMaj7 | EbMaj7 | |
| | iim
| V7 | Imaj7 | % | |
| |
|
| G: |
| Am |
D7 | GMaj7 | GMaj7 | |
| | iim
| V7 | Imaj7 | % | |
| |
|
| B: |
| C#m |
F#7 | BMaj7 | BMaj7 | |
| | iim
| V7 | Imaj7 | % | |
| |
|
| Eb: |
| Fm
| Bb7 | EbMaj7 | EbMaj7 | |
| | iim
| V7 | Imaj | %
| |
| |
|
Specify the tonal center above
each relevant juncture
"Giant Steps" (in 2/4):
in Generic Slash Bass Notation
| B: |
G: |
Eb: |
| (|
iim | V7 )| Imaj7 |
|
V7 | Imaj7 |
|
V7 | Imaj7 | % | |
| |
|
|
| G: |
Eb: |
B: |
| | iim | V7
| Imaj7 |
| V7 | Imaj7
|
| V7 | Imaj7
| Imaj7 | |
| |
|
|
| |
|
| Eb: |
G: |
| | iim | V7
| Imaj7 | % |
| iim | V7
| Imaj7 | % | |
| |
|
| B: |
Eb: |
| | iim | V7
| Imaj7 | % |
| iim | V7
| Imaj | % | |
| |
|
* * * * * * *
Thanks to Barry Dallman, Rick Zelle, Ryan Cullen, Sid
Thomas and
Scot Ranney of the Piano Guild at http://LearnJazzPiano.com
for their inspiration, comments and observations during the stages of
this article.
7
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