A Major Scale

Scale steps
W = 2 semitones H = 1 semitone
A2WB2WC1HD2WE2WF2WG1HA
Step Pattern: W–W–H–W–W–W–H (2–2–1–2–2–2–1 semitones)
On the keyboard
DEABDEABCFGCFG

Diatonic triads

Degree
Build the chord · root–3rd–5th

ROOTTAKESKIP

Chord semitone gaps
Ukulele G-C-E-A
I
ABCDE
A major

A · C · E

4 + 3 semitones
ACEA
21
2100
AEEC
123
2404 · ALT
ii
BCDEF
Bm minor

B · D · F

3 + 4 semitones
BDFB
4123
4222
xDFB
123
x222 · ALT
iii
CDEFG
Cm minor

C · E · G

3 + 4 semitones
GCEC
123
1104
GEEC
123
1404 · ALT
IV
DEFGA
D major

D · F · A

4 + 3 semitones
ADFA
123
2220
xDFA
12
x220 · ALT
V
EFGAB
E major

E · G · B

4 + 3 semitones
BEGB
2341
4442
GEEB
132
1402 · ALT
vi
FGABC
Fm minor

F · A · C

3 + 4 semitones
ACFA
213
2120
ACFC
2134
2124 · ALT
vii°
GABCD
Gdim diminished

G · B · D

3 + 3 semitones
BDGB
3142
4242
GDGB
1243
1242 · ALT