Number System
Number system and Basic Theory
The 'Number System" *for convenience all notes are written as #
Key 1 W 2 W 3 H 4 W 5 W 6 W 7 H 1 *W=whole step (2 frets) H=half step (1 fret)
C = C D E F G A B C
D = D E F# G A B C# D
E = E F# G# A B C# D# E
F = F G A Bb C D E F
G = G A B C D E F# G
A = A B C# D E F# G# A
B = B C# D# E F# G# A# B
Key of A
A B C# D E F# G# A
1 2 3 4 5 6 7 1
I A 1 3 5
iim Bm 2 4 6
iiim C#m 3 5 7
IV D 4 6 1
V7 E7 5 7 2 4
vim F#m 6 1 3
viidim G#o 7 2 4
Various A Chords
I7 A7 1 3 5 7b
IMaj7 AMaj7 1 3 5 7
Iaug A+ 1 3 5#
Idim Ao 1 3b 5b 6
I9 A9 1 3 5 7b 2
I13 A13 1 3 5 7b 6
Im7 Am7 1 3b 5 7b
Various Scales
Major scale ... 1 2 3 4 5 6 7
Harmonic Minor ... 1 2 b3 4 5 b6 7
Melodic Minor (ascending) ... 1 2 b3 4 5 6 7
Melodic Minor (descending) ... 1 2 b3 4 5 b6 b7
Pentatonic Major ... 1 2 3 5 6
Pentatonic Minor (Blues) ... 1 b3 4 5 b7
Various Modes
Ionian ... 1 2 3 4 5 6 7
Dorian ... 1 2 b3 4 5 6 b7
Phrygian ... 1 b2 b3 4 5 b6 b7
Lydian ... 1 2 3 #4 5 6 7
Mixolydian ... 1 2 3 4 5 6 b7
Aeolian ... 1 2 b3 4 5 b6 b7
Locrian ... 1 b2 b3 4 b5 b6 b7
The Chords and a couple of their inversions.
ABC BCA CAB
I 135 351 513
iim 246 462 624
iiim 357 573 735
IV 461 614 146
V 572 725 257
vim 613 136 361
vii o 724 247 472
The intervals within a chord
M2 = Major Second ... 2 frets apart
m3 = Minor Third ... 3 frets apart
M3 = Major Third ... 4 frets apart
P4 = Perfect Fourth ... 5 frets apart
d5 = Diminished Fifth ... 6 frets apart
P5 = Perfect Fifth ... 7 frets apart
m6 = Minor Sixth ... 8 frets apart
M6 = Major Sixth ... 9 frets apart
AB BC AC BC CA BA CA AB CB
M3 m3 P5 m3 P4 m6 P4 M3 M6
m3 M3 P5 M3 P4 M6 P4 m3 m6
m3 M3 P5 M3 P4 M6 P4 m3 m6
M3 m3 P5 m3 P4 m6 P4 M3 M6
M3 m3 P5 m3 P4 m6 P4 M3 M6
m3 M3 P5 M3 P4 M6 P4 m3 m6
m3 m3 d5 m3 d5 M6 d5 m3 M6
Change is interesting ...
Look at the interplay of the M3 & m3 intervals as well as the M6 & m6 intervals ... as you move through the key ...
Look at the stagnant nature of the P5 & P4 interval ... aside from the d5 sneakin' in there ...
The P5 and P4 are certainly not dissonant ... just a little boring to use as "flowing harmony" in a phrase ... but they do make a dandy place to land/pause.